Toyota Supra 3.0 A90

Toyota issued TSB T-TT-0642-21 for 2021 GR Supra models experiencing rapid oil consumption. The 2021 model year received a revised higher compression ratio (from 10.2:1 to 11.0:1) which introduced piston ring sealing issues. Affected cars consume a quart of oil every 2,000-3,000 km and trigger low oil level warnings. In severe cases, cylinder wall scoring occurs and requires full engine replacement. Toyota has replaced engines under warranty for confirmed cases, but out-of-warranty repair costs €6,000-8,000 for a replacement engine. The 2020 models with the lower compression ratio are not affected. From 2022 onwards, Toyota addressed the issue through revised piston ring specifications. When buying a 2021 model, request oil consumption records and check for any oil consumption monitoring cases opened with Toyota.

The B58 engine shares BMW's approach to coolant system design, using plastic and composite components for the water pump, thermostat housing, and coolant pipes. These components degrade under thermal stress and become brittle over time. The oil filter housing gasket (OFHG) is another common leak point where coolant and oil can seep due to hardened gaskets. The plastic coolant vent hose near the OFHG is particularly vulnerable. Symptoms include low coolant warnings, visible coolant residue around the engine, or a sweet smell from the engine bay. Water pump replacement costs €600-900 at an independent specialist, thermostat housing €300-500, and a full OFHG gasket set with coolant hose replacement costs €400-700. Proactive replacement of the coolant vent hose during any OFHG service is strongly recommended.

The B58 engine uses BMW's VANOS variable valve timing system with solenoids that are known to fail over time. The rubber O-rings on the solenoids degrade due to heat, and oil contamination can clog the solenoid internals. Symptoms include rough idle, loss of power, sluggish acceleration, and check engine lights with VANOS-related fault codes. BMW recommends replacing VANOS seals every 80,000 km as preventive maintenance. On the B58, the timing chain sits at the rear of the engine, and while VANOS component replacement does not require engine removal, access is more complex than on older BMW engines. Parts cost approximately €150-200 for both solenoids, with 2-3 hours of labour at a specialist. Total repair cost is €400-800 depending on the shop. Regular oil changes with BMW LL-01 approved oil help prevent premature failure.

The B58 engine valve cover gasket is prone to oil leaks as it ages, typically appearing after 50,000-70,000 km. BMW uses a magnesium valve cover on some B58 variants, which can warp slightly and create additional leak paths. Oil can seep into the spark plug wells, causing misfires, or drip onto the exhaust manifold creating a burning oil smell. Replacement requires removing the intake manifold and several ancillary components. Parts cost €100-150 for OEM gasket set, with 3-4 hours of labour. Total cost at an independent specialist is €500-700, while a dealer may charge €800-1,000. Using high-quality OEM gaskets is essential for a lasting repair.

Interior rattles are the most widely reported complaint on the A90 Supra. The door lock plunger rod area rattles against the door panel, B-pillar trim loosens and vibrates, the trunk area can resonate at certain speeds, and the centre console develops squeaks. The issue stems from insufficient padding and loose trim clips at factory. Most owners resolve this with DIY fixes: adhesive-backed foam pads under the door lock plunger rod, electrical tape where wire routing clips hook onto plastic trim, and additional foam at known contact points. Toyota has acknowledged the issue but has not issued a recall or TSB for it. Professional sound deadening and trim refitting at an upholstery specialist costs €200-500. This is a comfort nuisance rather than a reliability concern.

The ZF 8HP51 transmission is labelled as lifetime-fill by the manufacturer, but ZF's own service schedule calls for fluid and filter replacement every 80,000-100,000 km. Skipping this service allows oxidation and fine metal particles to accumulate, damaging valve body surfaces and solenoid bores. Early symptoms include a noticeable flare or hesitation during the 3-4 upshift, rough low-speed engagement, and occasional torque converter shudder. A preventive transmission fluid and filter service costs €300-500 at a specialist and is the single most important maintenance item for transmission longevity. If the valve body is damaged from neglect, replacement costs €1,500-2,000. The ZF 8HP is inherently reliable when properly maintained, and stock power levels are well within its capacity.