First I'd like to say that I'm new to the site and hats off to everyone that is a part of this site....Full of great advice. My question is that I currently own a 1999 ML430 with 46k I've been changing my own oil every 5k with Mobil1 0w40w. I live in NY and it's about to get very cold, well below 0 degrees. Should I be changing oil weights in the winter? This is my first winter with the truck and I'm not sure if I should continue to use the 0w40w oil. I believe that Mercedes recommends to use the 0w40w all year. Any insight would be truly appreciated.

I think you'll be fine with the 0-40 in the winter. Maybe in the summer you could go 20-50, but anything with the "W" number at 5 or 10 (or less, like this "0" weight) should be great at subzero temps.

Gilly

Gilly,
Thanks for the help, This is a great site!!!