My Supra's Singing

mrnickleye · 09-12-2006, 06:12 AM

Our cars are old, and even when new, they were designed to run 10w-40 most of the time.

Many newer cars are running 5w-30 and synthetic 5w-30 because of the tighter clearances (bearings / pistons) due to increased (tighter / lower #s allowed) emission standards.

Perhaps 1 more MPG.

Also the tighter clearances require a thinner oil to help get it everywhere in the engine quicker.

09-12-2006, 06:12 AM	#5
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Our cars are old, and even when new, they were designed to run 10w-40 most of the time. Many newer cars are running 5w-30 and synthetic 5w-30 because of the tighter clearances (bearings / pistons) due to increased (tighter / lower #s allowed) emission standards. Perhaps 1 more MPG. Also the tighter clearances require a thinner oil to help get it everywhere in the engine quicker. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.