F10 M5 S63 twin turbo V8 — reliability at 100k km, what to expect

Great write-up. I have an F10 M5 at 85k km and your experience mirrors mine almost exactly. The oil consumption and turbo coolant lines are the two things every S63 owner needs to watch.

For the turbo coolant lines, I replaced mine with silicone lines from a company called FTP Motorsport. They are much more durable than the OEM plastic lines and should last the life of the car. Cost was about 200 EUR for the kit plus 3 hours of labor.

On the stage 1 tune — I am running a BM3 stage 1 map on 98 octane and the difference is dramatic. The car feels like it has an extra 100hp in the midrange. The ZF 8HP with a TCU tune shifts so fast it feels like a dual clutch.

The F10 M5 is an underrated bargain right now. You can pick up clean examples for 25-35k EUR, which is incredible value for a 560hp luxury sedan. The depreciation has been brutal but that works in the buyers favor.

One thing I would add to the maintenance list — check the differential fluid. The M diff runs hot and the fluid breaks down faster than BMW suggests. I change mine every 30k km with Castrol SAF-XO.

Also, the carbon ceramic brakes (if equipped) are a double-edged sword. They last a long time but when they need replacement, budget 8000+ EUR for a full set. Many owners switch to steel rotors at that point.

Regarding the ZF 8HP TCU tune on the F10 M5 — it is genuinely transformative. The stock calibration is already good in sport mode but a TCU tune from xHP or BM3 makes the shifts almost instantaneous. Launch control becomes much more aggressive too.

I would say the TCU tune is the single best modification you can do to any BMW with the ZF 8HP automatic. The improvement in driving experience is immediate and dramatic, and it costs a fraction of what engine tuning costs.