| |
Click on image for the lowdown. 
====
| | |
10 members (mk72, Guitplayer, cmayna, 5 Window 9434, Opelika Tom, TooMany2count, Otto Skorzeny, JW51, Gib70, 1 invisible),
76
guests, and
1
robot. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,053 Posts1,055,776 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | I recently went from 10w30 to 15w40 and have seen some improvements in several engine area's.
I haven't been into the bottom end yet but the head has been totally rebuilt with the exception of the rockers and push rods.
Improvements I've seen w/the thicker oil:
1) Higher oil pressure. With the 10w30 the oil never got to 15 psi. I would gestimate 12 to 13 psi max.
With the 15w40 the oil idles @ 15 psi and I'll estimate 17 to 18 psi @ speed.
2) The engine it quieter. Theres less valve train noise and no bottom end noise.
Neither oil produced any smoke and engine temps were about the same.
I'll be closely monitoring the engine come colder temps as this will the my 1st winter w/the truck running. I'm not adverse to changeing to a thinner winter oil if necessary.
For warm/hot weather temps the engine seems to run much better w/the thicker oil.
Dave
| | |
|
|
| |
