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McLaren 720S Service & Repair Toronto | Thorney Motorsport
McLaren 720S · 720S Spider · M840T Specialist
McLaren 720S Service.
Without the dealer markup.
Repair / Performance / Calibration / Bespoke
Independent 720S specialists working out of Thorney Motorsport Toronto. Turbo inlet upgrades, A/C compressor service, hydraulic suspension rebuilds, SSG clutch and TCU work — at a fraction of the dealer's bill. Serving Toronto, the GTA, and southwestern Ontario.
M840T · 4.0L Twin-Turbo V8 · Super Series
The 720S replaced the 650S in 2017 — and rewrote the Super Series rulebook.
A new carbon Monocell II tub, a heavily reworked engine, second-generation Proactive Chassis Control, and a step in build quality McLaren needed. Five years of production left it as the most-supported, most-tunable, and best-understood modern McLaren on the road — and the one we see most often at the shop.
The flip side is that the 720S inherits some Super Series gremlins (hydraulic accumulator wear, composite-panel paint bubbling) and introduced a few of its own — most notably the turbo inlet baffle issue and the always-on A/C compressor. The faults are well-mapped. Every one of them has a known fix.
What We See
720S common issues. Documented, not guessed.
The 720S is one of the great driver's cars of the last decade — and like every modern McLaren, it has a handful of items worth knowing about. The list below blends what owners have documented in the McLarenLife community, what Thorney Motorsport UK has written up in their workshop articles, and what we see here at the shop on a weekly basis. None of it should put you off the car. These are simply the items every current and prospective 720S owner should keep an eye on.
01
Turbo inlet baffle / diffuser failure
The OEM turbo inlet pipes house a resin-bonded baffle plate. Under sustained boost it can dislodge, get ingested into a compressor wheel spinning past 100,000 rpm, and destroy the turbocharger. McLaren released an updated inlet pipe; the standard preventive fit now is an aftermarket silicone inlet (Renaissance Speed, similar). Inspect both sides on any 720S we touch.
- Symptom: hissing under boost, lean fault codes, sudden power loss
- Confirm updated McLaren part or aftermarket silicone is fitted
- Failed turbo is a five-figure replacement — prevention is the only sane play
02
A/C compressor failure (always-on design)
The 720S A/C compressor has no clutch — it runs at 100% duty cycle whenever the engine is running. McLaren modified the Lovejoy coupling to absorb thermal and load shifts, but failures still happen, including on cars under 8,000 miles. Replacement parts have been supply-constrained at times pending a service campaign.
- Symptom: warm air at the vents, intermittent on cold start
- Test with a vent thermometer at idle for ten-plus minutes in the heat
- Known coupling and bearing failure mode — both addressed in the repair
03
Hydraulic accumulator failure (Proactive Chassis Control II)
The four hydraulic accumulators that store pressure for the interconnected suspension lose their gas charge over time. Symptoms: PCC errors on the dash, mode-change refusals, ride feeling hard regardless of selected mode, the car sitting at slightly different ride heights cold versus warm. Replacement is all four together — special tooling is required to release system pressure safely.
- Symptom: PCC fault, harsh ride, uneven cold-set ride heights
- Typical age window: from about year five onward
- Dealer quote $3,300–$3,400 parts; we do it for materially less
04
Composite panel paint bubbling
720S front wings, front inspection panel, rear wings, and engine cover are composite. Moisture trapped in the laminate can lift the paint at panel edges as the car ages — same failure mode as 12C, 650S, 675LT, and 765LT. McLaren's typical fix is panel replacement, not refinish. The front inspection panel is the first place we look on every used 720S.
- Inspect under raking light at every panel edge — front inspection panel first
- Often eligible under McLaren's cosmetic warranty when in date
- If covered, this is one to claim before warranty expires
05
External trim looseness · cabin rattles
Early build 720S cars have a documented run of trim issues — exterior pieces working loose, door cards rattling under bass, plastics fading from heat cycles. Most are addressed in later production. We tighten, re-bond, and replace clips as part of any annual service.
- Door card rattles excited by audio bass at low frequencies
- Forum consensus: avoid earliest 2018 production where possible
- Later builds are noticeably better
06
Brake-line routing recall (NHTSA 25V216000)
April 2025 recall covering certain 2020–2025 720S cars together with 600LT, GT, GTS, and Artura. Incorrectly routed hydraulic brake lines could activate the wrong-side brake under high-load ABS or ESP intervention — in one documented case, locking a rear wheel mid-corner. Every 720S we PPI gets a VIN check against this recall, and if not complete, we route it to the dealer to finish.
- Affected cars: limited; verify by VIN, not assume by year
- If outstanding, dealer fix only — manufacturer-authorized procedure
- One of two live 720S recalls owners should know about
07
Key recognition · phantom alarm gremlins
Recurring complaint: car occasionally fails to detect the key fob inside the cabin, intermittent alarm triggers. Often tied to weak fob battery or to receiver-module software version. Fob battery replacement is a five-minute fix; module reflash is a workshop job.
- Start with the fob battery — a $5 fix solves most cases
- If unresolved, OE software refresh on the BCM family
- Not a safety item but undermines confidence in the car
08
Air-intake resonator broken mounting tabs
Plastic mounting tabs on the intake resonator become brittle from heat cycling and break — same family of part shared with the McLaren GT and 765LT. Once a tab breaks, you get a hiss under boost, rough idle, and lean-code CELs. Replacement resonator with reinforced tab area; we hold these in stock.
- Symptom: hissing under boost, rough idle, lean codes
- Inspect tabs visually any time intake is opened
- Common across 720S, McLaren GT, 765LT
09
Gorilla Glass roof panel cracking (optional doors)
The 720S was offered with optional Gorilla Glass tops in the dihedral doors. Across three production generations (Gen 1, Gen 2, Gen 3) the panels stress-cracked — sometimes within the first 1,000 miles. McLaren issued a TSB blaming the adhesive, but the documented root cause is door-alignment stress on closure combined with oversized glass that pressed against its frame. McLaren eventually removed the option from the range entirely and now offers a polycarbonate replacement panel with a 2-year warranty. Carbon-fibre aftermarket replacements are also available. If you are buying a 720S with the Gorilla Glass option, treat the glass as a wear item that will likely need to be replaced.
- Symptom: hairline star fractures, often starting at a panel edge with no impact point
- Confirm which generation is fitted, and whether McLaren has already swapped to polycarbonate
- Check door alignment carefully — misalignment loads the glass
- Replacement: polycarbonate (OE), carbon-fibre (aftermarket), or — increasingly rare — Gorilla Glass
Pre-Purchase Inspection
The 720S PPI checklist we'd want done on our own car.
A McLaren 720S is one of the great driver's cars of the last decade. It's also a complex piece of kit with a known set of failure points. Buying without an independent PPI from a specialist is buying a problem you can't see — and an out-of-warranty turbo, accumulator set, or A/C compressor will pay for the PPI ten times over.
Pull the airbox covers
Inspect both turbo inlet pipes for baffle integrity. Confirm whether updated McLaren inlet pipes or aftermarket silicone replacements are fitted. If still on original resin-bonded baffles, recommend immediate replacement.
Cold-start ride-height check
Let the car sit overnight. Photograph all four corners with a tape measure cold, start the car, watch the rise. Uneven rate or different settled heights warm vs. cold tells you the accumulators are tired.
A/C cold-air duration test
Vent thermometer at idle in heat for ten-plus minutes. Compressor failures can be sudden — the compressor that worked at the test drive can fail before the car is on the trailer home.
Composite panel edges
Under raking light, inspect every panel edge for paint micro-bubbling. Front inspection panel first, then front wings, then engine cover, then rear wings. Bubbling means panel replacement.
NHTSA recall VIN check
Run the VIN against NHTSA 25V216000 (brake line routing). If outstanding, the dealer is the only authorized remedy. We arrange the appointment for our PPI customers.
Forum-known weak points
Door cards for rattle, exterior trim for tightness, plastics for heat fade, IRIS for clean cold boot. Avoid earliest 2018 production unless the price reflects it. Later builds are noticeably better.
Spider-specific checks
Cycle the roof three full open-close passes, listen for mechanism noise, inspect glass rear screen for any movement or seal lift. Confirm tonneau alignment and cabin water-tightness.
Gorilla Glass door panels
If optioned, inspect both door-top glass panels under raking light for hairline stress cracks (often starting at an edge, no impact point). Verify door alignment — misalignment is the root cause. Confirm whether McLaren has already swapped to polycarbonate replacements.
Underbody, brakes, alignment
Most 720S cars are low and many are scraped. Carbon-ceramic rotors for heat scoring, lip, pad-witness wear. Alignment sheet history if available. Underbody for impact damage to splitter, side skirts, rear diffuser.
Book a 720S PPI ›
Toronto-area PPIs by appointment. Enclosed transport coordinated where required.
Service Schedule
720S service schedule. Straight from Thorney.
This is the published Thorney Motorsport McLaren service schedule, used worldwide by every TMS International dealer including Thorney Motorsport Toronto at Foreign Automotive. Covers every modern McLaren model. Each yearly service builds on the core oil-and-filter — the heavier years add brake fluid, cabin filter, air filters; year 5 adds coolant; year 10 is the big one. After year 10 the schedule starts again. Kilometre-triggered items (clutch oil, gearbox oil, spark plugs) layer in on top when their km trigger comes due.
| Service | Parts Required | Notes |
|---|---|---|
| 1st | Oil Filter, Oil, Consumables | — |
| 2nd | Oil Filter, Oil, Brake Fluid, Cabin Filter, Air Filters, Consumables | — |
| 3rd | Oil Filter, Oil, Consumables | — |
| 4th | Oil Filter, Oil, Brake Fluid, Cabin Filter, Air Filters, Consumables | — |
| 5th | Oil Filter, Oil, Coolant, Consumables | Coolant year |
| 6th | Oil Filter, Oil, Brake Fluid, Cabin Filter, Air Filters, Consumables | Charcoal fuel filter if required * |
| 7th | Oil Filter, Oil, Consumables | — |
| 8th | Oil Filter, Oil, Brake Fluid, Cabin Filter, Air Filters, Consumables | — |
| 9th | Oil Filter, Oil, Consumables | — |
| 10th | Oil Filter, Oil, Brake Fluid, Cabin Filter, Air Filters, Coolant, Consumables | The big one |
| …then the schedule restarts from year 1. | ||
Kilometre-triggered items
Layered into whichever annual service the car hits when the km trigger comes due.
| Kilometres | Parts Required | Notes |
|---|---|---|
| 32,000 km | Clutch Oil + Filter | DCT health |
| 64,000 km | Clutch Oil, Gearbox Oil, Filters | Major DCT |
| 96,000 km | Spark Plugs | Labour varies by model |
* On the 6th year "charcoal fuel filter" item: McLaren recommends replacement of the charcoal fuel filter on Sports Series models (540C, 570S, 570GT, 600LT, 620R) at the 6th-year service, which requires removing the fuel tank — a labour-intensive job. The 720S is Super Series and is not affected by this. For Sports Series owners, Thorney's position — and ours — is that McLaren's 6-year recommendation is excessive. The filter supplier's own recommendation is 100,000–160,000 km. We only replace if there's a fuel smell after brimming the tank or starting issues after a fill-up. An informed owner is the best owner.
Schedule above is published by Thorney Motorsport UK — see the McLaren Service Schedule on their site for the source. Every TMS International dealer, including Thorney Motorsport Toronto, follows this schedule. Subtle differences exist for the 765LT, 675LT, 600LT and GT but are minor and not worth listing separately. The Senna, P1 and F1 are not covered by this schedule.
Affordable McLaren Ownership
Own the car. Lose the anxiety.
Modern McLarens have a reputation for intimidating service bills that keeps some prospective owners away from one of the great driving cars of our era. The honest truth is that the platform is well-understood. The known issues have known fixes. A specialist who actually knows the cars can keep one running properly for materially less than the reputation implies — and that's exactly what we're here for.
i
Real solutions for the known faults
Every item on the common-issues list above has a fix we've done many times over. Turbo inlets, hydraulic accumulators, A/C compressor, Gorilla Glass, DCT fluid, intake resonator tabs — known parts, known procedures, fair labour. Owning a 720S does not have to mean a six-figure parts catalogue.
ii
OE-grade work at independent rates
We run McLaren-grade diagnostic software, OE service procedures, and genuine McLaren parts where they matter. The savings come from operating as a focused independent specialist — not from cutting corners on the work itself. You get the same quality outcome at a price that makes regular service realistic instead of dreaded.
iii
Thorney UK platform depth
Thorney Motorsport in the UK has been the world's leading independent McLaren house for fifteen-plus years. Their workshop articles on accumulator failure, bodywork corrosion, and DCT seal repair are the reference for the entire independent McLaren community worldwide. Toronto operates as the Canadian arm — same engineering brain, closer to home.
iv
Quoted before we start. Every time.
You see the bill before we touch the car. Parts source identified (OE, OE-equivalent, or Thorney-developed). No surprise invoices, no "we'll see how long it takes" labour. Predictable cost is half the affordability story — and it's how we want every 720S owner to feel about bringing the car in.
v
Factory warranty stays intact
Canadian consumer law protects your right to service your McLaren at a qualified independent shop without affecting factory warranty, provided the work meets manufacturer specification and is documented. We keep a complete dealer-standard digital service record for every car that passes through.
vi
The car you bought for the reason you bought it
The 720S is a thrilling car. It deserves to be driven. We're here to make sure cost-of-ownership concerns never become the reason yours sits in the garage. Annual service, the occasional repair, a PPI before your next McLaren — that's the whole picture, and it's a manageable one.
Other McLaren Models
We cover every modern McLaren. Pick your platform.
Each model has its own page covering platform-specific common issues, PPI red flags, and the service schedule we follow. Return to the Thorney Motorsport Toronto McLaren hub for the full picture, or jump directly to a specific car.
← All McLaren Models · Thorney Motorsport Toronto Hub
Return to the parent page for every McLaren we service
540C
Sports Series entry
570S
Sports Series flagship
570GT
Sports Series GT
600LT
Sports Series Long Tail
620R
Road-legal GT4 homologation
12C · MP4-12C
Where it all started
650S
Super Series predecessor
675LT
Super Series Long Tail
765LT
Final M840T Long Tail
GT
Grand tourer
Artura
Hybrid V6 platform
P1
Ultimate hybrid hypercar
Senna
Track-focused Ultimate
Speedtail
Three-seat hyper-GT
Elva
Open-cockpit speedster
Drive-In Map
Where 720S owners come from. Toronto, the GTA, the corridor west.
Most of our 720S customers drive in from the GTA. For southwestern Ontario McLaren owners, we are the closest Thorney-grade independent specialist.
Toronto80 min
North York75 min
Mississauga60 min
Oakville55 min
Burlington50 min
Georgetown55 min
Milton50 min
Hamilton45 min
Brantford35 min
Guelph25 min
Cambridge15 min
KitchenerHome shop
Waterloo8 min
Stratford40 min
New Hamburg15 min
Elmira15 min
Fergus35 min
Listowel45 min
Enclosed flatbed transport for out-of-province owners arranged on request. Roadside-assistance services that aren't exotic-trained should never load a McLaren.
Get In Touch
Book your 720S in. We'll handle the rest.
Whether it's annual service, a stubborn fault you can't get to the bottom of, a PPI before you commit, or a full performance build — give us a call. Walk-in welcome by appointment.
30 Adam Ferrie Pl, Kitchener ON N2E 2A9 · Monday–Friday 08:30–18:00