Originally posted by warmonger:
1. 3L heads have three drains. The 2.5L heads in the contours have two drains.

2. I've had DemonSVT get all over my case about bearing clearances and the like with the thicker oil, but I know what it is like in a hot climate and I have plenty of proven miles.


1. "per head" (just to clarify)
The 3L has 1 more large oil drain per bank and a larger cross drain.

2. Only the "20" part of the oil viscosity. That means less start up flowability and protection. A 20W50 of is roughly 32 viscosity oil at 100 degrees. That's slightly worse then running straight 30 at engine start up. 5W30 is roughly 15 and a 0W40 is roughly 15.

I run a 40 weight oil myself. (0W40) A 50 weight is not unheard of for Arizona's summer temperatures. (any overly hot climate)


Tom did hit the sore spot. The oil does pool on the outsides and rear of the heads. I don't know why they did not put even a small drain in that location.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.