At what temp can I use 15w40?

Status
Not open for further replies.
A synthetic 15w-40 and say a Delo400 15w-40 may speak a different tone. I don't think a 15w-40 synthetic would differ than a dino Delo400 10w-30.

The Amsoil 15w-40 say to speak flows as or better than the Delo400 10w-30 in any given term. Sorry if I was miss quoted.
 
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).


Get a good 5w30 (Castrol GTX) and start the treatment.

There is NO NEED to use heavy oil.
 
Thorn, I've got the same EJ22 engine in my '97 Impreza. Last summer, I ran 15w-40 and got the best mileage ever (had a 40 minute commute each way). We've owned the car since new, and except for last summer, it's had 5w-30. The mileage INCREASE has been see by some on this board as a halucination of mine. Although I can't explain it, it lasted the entire time that oil was in there. I'm not saying you mileage will go UP, especially if you have short trips, I'm just saying you soob will probably enjoy the HDEO as much or more than anything else that's been in there.

Dave
 
Status
Not open for further replies.
Back
Top