Independent 675LT and 675LT Spider specialists at Thorney Motorsport Toronto. The polycarbonate engine cover issue, hydraulic accumulators, drive-line damper service, plus all Super Series items — OE spec, at a fraction of the dealer's bill.
McLaren’s 2015–2017 Super Series Longtail. Lighter, stiffer, more power (666 hp), 50% of internal engine components new vs. 650S, clear polycarbonate engine cover, dive planes, top-exit exhaust. Built in just 500 coupes and 500 Spiders — collectible from day one, and now genuinely valuable.
The 675LT has a documented platform-specific issue with the clear polycarbonate engine cover — ageing, micro-cracking, scratching adjacent paint. Inside the engine bay the LT runs hot, and over time that heat eats at adjacent rubber and plastic. All standard Super Series items (accumulators, transmission weep hole, paint bubbling) apply equally.
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Visual concept · Illustrative components
Select a system to explore specialist 675LT care.
Faults, Symptoms & Repair Options
The 675LT needs its own parts and use-history review alongside Super Series gearbox and hydraulic suspension checks. Coupe and Spider body hardware differ, and track wear should be documented rather than inferred.
675LT Graziano seven-speed SSG
Thorney documents bearing and seal failures producing leakage at gearbox tell-tale openings. [1] [2]
Identify the fluid and inspect the leak before planning a seal or internal repair. Keep the drain opening unobstructed and bring any previous gearbox invoices.
Explore Transmission Repairs675LT Proactive Chassis Control
Thorney’s rebuild service addresses damper seals, damaged internals and associated spring components. [3]
For a harsh ride or suspension warning, check hydraulic pressure, accumulator condition and damper leakage. The system needs a measured diagnosis before a replacement list is chosen.
Explore Damper Repairs675LT; panel material matters
Thorney documents bubbling associated with aluminium or composite panel construction. [4]
Inspect the affected panel and previous paintwork. Photograph the area before treatment; repair options depend on its material and the extent of the problem.
675LT Spider only
Report the exact stage where the roof stops and any damp trim. Check the luggage divider, latch feedback, hydraulics and battery condition as applicable; forcing the mechanism can compound the problem.
A documented fault is not a prediction for every car. These checks depend on the VIN, engine, equipment and service history. Recall references may describe US-market vehicles; confirm Canadian applicability and completion with the manufacturer. Recall remedies are arranged through its authorized network.
Start with the model year, VIN, symptoms and previous invoices. We discuss the inspection needed to identify the cause, then explain the findings and proposed work. A warning message or a fault listed above does not, by itself, establish which part needs replacement.
Sources checked 7 September 2026. Bulletin and campaign applicability must be confirmed for the individual vehicle.
Experiencing one of these symptoms?
Send your 675LT’s year, mileage, warning messages and service history. Our shop is at 30 Adam Ferrie Pl, Kitchener, serving Waterloo, Cambridge, Guelph and the GTA.
Buying a McLaren 675LT without an independent PPI from a specialist is buying problems you can’t see. The list below is what we work through on every 675LT that comes through the shop for a PPI.
Inspect for yellowing, micro-cracking, delamination at the carbon perimeter. Look at surrounding paint for scratch marks from the cover being raised against it.
Every rubber hose, every plastic clip, every loom for heat fatigue. The LT runs hotter than a 650S — inspect accordingly.
Overnight sit. Tape measure all four corners cold. Watch the rise on startup.
Open and clear. Fluid trace = internal seal failure. Plugged hole = walk away.
Front inspection panel first. Then front wings, then engine cover edges.
Drive 1–7 fully, listen for clunky cold shifts and damper noises specific to the LT platform.
McLaren or qualified independent only. Confirm coolant service with full clamp replacement, PCC accumulator history, weep-hole inspection records.
Pull ECU codes. Look for cylinder-specific patterns. Coil/plug, injector, or both.
Three full roof cycles, glass rear screen movement check, tonneau alignment, seal integrity.
Toronto-area PPIs by appointment. Enclosed transport coordinated where required.
This is the published Thorney Motorsport McLaren service schedule, used worldwide by every TMS International dealer including Thorney Motorsport Toronto. 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.
| 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. | ||
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. The 675LT is Super Series and is not affected by this. Sports Series owners can see our position on this item on the respective Sports Series model pages.
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.
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.
Every item on the common-issues list above has a fix we’ve done many times over. Known parts, known procedures, fair labour. Owning a 675LT does not have to mean a six-figure parts catalogue.
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. Same quality outcome at a price that makes regular service realistic instead of dreaded.
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.
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.
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.
The 675LT 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.
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.
Most of our McLaren customers drive in from the GTA. For southwestern Ontario McLaren owners, we are the closest Thorney-grade independent specialist.
Enclosed flatbed transport for out-of-province owners arranged on request. Roadside-assistance services that aren’t exotic-trained should never load a McLaren.
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
