McLaren Senna buying guide

There is one road version to track here, the Senna. Its engine shares core architecture with the McLaren 720S but has its own tuning for high downforce, according to CarsCounsel.

Two rarer derivatives exist. The Senna GTR is track-only, with 814 hp, a faster dual-clutch gearbox, and a conventional suspension based on the 720 GT3 race car in place of the road car's hydraulic setup. PistonHeads says its aero was reworked for as much as 1,000 kg of downforce at 155 mph, and 75 were to be built. The Senna LM is a joint MSO and Lanzante Motorsport project with the GTR's 814 hp, solid doors, some titanium panels and OZ centrelock wheels. 35 were built.

Car Collector International advises buying the best-documented car in the most desirable specification rather than a tired example of a rarer derivative. The best cars come with an unbroken ownership record, numbers that match, the original manuals and toolkit, factory build paperwork and a McLaren Special Operations service record. CarsCounsel says to avoid heavily tracked cars with no factory refresh, since the brakes, aero actuators and transmission take huge stress.

You can compare examples on our Senna market page. If you are coming from older McLarens, our 650S and 675LT guide and 12C guide show how different the Senna is. Cars with a thin file are the ones to leave alone, however attractive the specification looks.

Two recalls and an aero hydraulic system are the main concerns.

Fuel tank corrosion

A noise and vibration foam pad under the fuel tank can hold moisture, corroding the tank and causing a fuel leak. A leak near an ignition source raises the risk of fire. The recall remedy is to remove the pad and inspect the tank, replacing it if corroded, free of charge.

Engine harness chafing

A branch of the engine harness can touch a metal link pipe heatshield and chafe over time. In McLaren's sample of 61 cars, 15% showed marking on the outer cover and none had damage to the wiring inside. Possible consequences include limp mode, torque limitation, stalling, misfire and catalyst overheating.

Aero hydraulic actuators

The rear wing and front blades work on hydraulic actuators. CarsCounsel warns that neglected hydraulic servicing can lead to actuator failure, and that repairs need specialized diagnostic software and proprietary McLaren parts.

Track wear

Brakes, aero actuators and the transmission all take heavy stress on a tracked car. Ceramic rotors in particular should be checked for track-day wear. A seller who cannot show what the car has done on circuit, or who has no refresh record from the factory, leaves you guessing about all three systems at once, so ask directly how often it has been tracked.

Luxury Cars Guide puts an annual service at around $2,200. Hydraulic servicing for the aero should not be skipped, as CarsCounsel links neglect to actuator failure.

Car Collector International says deferred maintenance on a car of this class almost always costs more than buying a better-sorted one. Compare cars with that in mind, using our McLaren price guide. Put the annual service figure beside the price of any car you consider, and ask what has been done recently rather than what is due. A car with the hydraulics, brakes and recall work already handled is worth more of your attention than one that needs them.

Buy the best-documented Senna with MSO service history, matching numbers, and proof that both recalls were done. CarsCounsel rates the 2019 Senna Good With Inspection because of those recall campaigns, and calls an independent specialist inspection mandatory. Skip heavily tracked cars with no factory refresh.

Car Collector International rates the V8 as strong, so what varies from car to car is service intervals, brakes and aero hardware. Test the wing and flaps, and read the hydraulic fluid and lines.