You can type here any text you want

Is it time to change oil viscosity?

Welcome!

By registering with us, you'll be able to discuss, share and private message with other members of our community.

SignUp Now!

TURBO2

Member
Joined
Feb 2, 2002
Messages
262
I have a 1986 GN with around 108,000 miles on it. I'm using the factory suggested 10w-30 and have about 70 psi oil pressure when cold, but once it heats up the pressure drops to only about 17-18 psi. Should I switch to 10w-40 or 20w-50?
 
Many dont agree with this but i run Vr1 20/50 in NY summer and 10/40 in the fall/winter for 20 years , with only showing a 3 psi hot idle difference

A front mount will put you over 200 degrees on the streets without good dual fans
 
Only my opinion but I wouldn't run a thicker oil with that cool of an operating temp especially with the fan upgrade.
 
The manual in my (87) says 5-30. Only used 10-40 from the start.
Back in the day Kenne Bell I would say was the big guru and always used 10-40 and recommended it.
And the 10-40 today is way better then 40 years ago
All those 6.2l engines GM has to recall use 0-20. One of the changes will be to have owners switch 0-40 or perhaps
5-40. Hoping to push it over the warranty.
I guess if you're buying new today you pick your poison and hope for the best.
 
Back
Top