quote:
Originally posted by Thorn:
BlazerLT,
You're right. There is way too much information on this site for a fence-sitter like me. I just need to pull the trigger and go with the Auto Rx.
The owner's manual recommends API classification SH or SG. The manual has a temperature chart showing 5w30 being "Preferred" from 40C and below. 10w30 and 10w40 are listed from -20C on up, but it doesn't say "Preferred".
There is another section with recommended grades and viscosity under "severe driving conditions." This list shows API classification SH in SAE viscosity No. 30, 40, 10w50, 20w40 and 20w50.
Wow! I never realized I had so many choices. I'm not a car guy, and I found this site almost by accident. I, and the local iffy lube shops, have been feeding this car a steady diet of dino 5w30 since new.
Do you think it's time for a change? Maybe I should go with 10w30 or 5w40 in the summer, and 5w30 in the winter. I would really like to squeeze another couple of years out of this vehicle, which would put it well over 200K (170+K currently).