Start-up protection is the key, after warm up, engine temperature remains roughly the same, regardless of ambient temperature.
0W40 synthetic, a very good choice.
One must not forget that their are advantages and disadvantages between conventional and synthetic. Seals etc. do not like synthetic too well.
Around 5000 miles is a good time to change the oil, whether conventional or synthetic. Contamination is more of a concern than oil break down.
Disregarding price, I would choose 0W40 synthetic as well.
94 E320 58000 Miles
Last edited by zafarhayatkhan; 05-28-2003 at 05:43 PM.