I was going through some old MB texts that they gave with the car when new and I ran across the recommended fluids sheet. It showed that Mobil1 15w50 is a year round oil while Mobil1 5w30 should only be used below 30F. I'm outside of Chicago and an thinking of switching over to Mobil1 15w50 for year round use. It is an 1988 300E with 105000miles. Is there anybody else out there in similar climate who is also using this oil. If so your input is greatly appreciated.
Thanks,
Dino