A ajax Joined Jul 6, 2002 Messages 50 Location vancouver,wa. Oct 26, 2002 #1 10w40,in a Z28,LS1,30K on engine,mild climate,Thanks p.s. I know 10w30 is called for,I have a friend that has the 15w40,that i can get now.
10w40,in a Z28,LS1,30K on engine,mild climate,Thanks p.s. I know 10w30 is called for,I have a friend that has the 15w40,that i can get now.
A ajax Thread starter Joined Jul 6, 2002 Messages 50 Location vancouver,wa. Oct 26, 2002 #2 that should read 15W40.
Patman Staff member Joined May 27, 2002 Messages 23,686 Location Guelph, Ontario Oct 26, 2002 #3 The 15w40 should work fine in the summer, but I don't know if I'd run it in the cooler months. The LS1s really like 10w30, you'll lose a couple of ponies and a bit of MPG with the thicker oil.
The 15w40 should work fine in the summer, but I don't know if I'd run it in the cooler months. The LS1s really like 10w30, you'll lose a couple of ponies and a bit of MPG with the thicker oil.