5W30 vs 5W40 in a GM car

[clarkz71]

Interesting that Chrysler DID recommend a 5W40 back then.
Like I told GM customer service, oil technology has advanced
in the last 22 years since the Northstar was designed.
.

 

[zeng]

Originally Posted By: clarkz71
Interesting that Chrysler DID recommend a 5W40 back then.
Like I told GM customer service, oil technology has advanced
in the last 22 years since the Northstar was designed.
.

+1

Thanks for sharing.

Btw, what's your take on my comments above dated 09/06/15 , that Merc/Northstar bearing

clearances appears to be on the coarse side

 

[clarkz71]

Originally Posted By: zeng

+1

Thanks for sharing.

Btw, what's your take on my comments above dated 09/06/15 , that Merc/Northstar bearing

clearances appears to be on the coarse side

Compared to the Asian specs, yes.

Compared to high performance domestic V8 engines, no.

 

[zeng]

Originally Posted By: clarkz71
Originally Posted By: zeng

+1

Thanks for sharing.

Btw, what's your take on my comments above dated 09/06/15 , that Merc/Northstar bearing

clearances appears to be on the coarse side

Compared to the Asian specs, yes.

Compared to high performance domestic V8 engines, no.


+1

How about Asian bearing specs (4I) against domestic V6 and 4I , within last 5-10 years

production , with 0W-20 as standard oils ?