Mani,
Take a look at your owners manual, it will list which oil viscosities are acceptable at which temperatures. Mine lists a 10W30 for temperatures below 50F.
I also had my mechanic change my oil and he would charge $80 for the oil change using Valvoline Synthetic 15W40. I didnt have any problems but I decidede to start changing my own oil and spending the labor on better oil. I now use Amsoil 10W40 Full Synthetic and the car runs and starts so much better.
__________________
Afshin
Current:
02 C32 AMG
Previous:
92 500E
84 190E 2.3 5 Spd
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