well I do use synthetic. LOL i watch my neigbour in her new Jeep grand cherokee and every cold morning when she is in a rush she just jumps in the car and FLOORS it to work. Its a V8 so maybe its stronger but its still an ordinary engine. Will she do any harm ? The car is a 2000 and has 60 000 km on it and i doubt it has synthetic.

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99 C43
98 S420
99 C230K
01 C240