The MGU is from the hybrid unit xD. 2 MGU, 1 clutch, 1 oil pressure, and the ByKolles IDK.
Look at the LMP2. Very reliable engines. Not supercomplex engines.
The MGUs never caused retirements. They were both changed. The #2 had the MGU changed and won the race, whilst the #8 had the MGU changed and finished 9th. The only retirements were clutch failure, engine failure and driver failure.
The ByKolles went off on lap 1 and destroyed the nose on the rumble strips on the exit of Tertre Rouge. The nose collapsed and blocked the cooling ducts to the engine, which cooked the engine. It technically retired because the engine failed, but it failed because a driver went off and damaged the cooling system.
People say the hybrids are too complicated and need binned, and that's why we had a high retirement rate. That isn't what happened. The sparky sparky stuff all worked and when it broke, it was fixed. It was the good old fashioned roundy round and uppy downy bits that broke. Shall we get rid of internal combustion engines too now? Had a lot of tyre failures...maybe we don't need these round rubber things either.
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