WHAT OIL TO USE
 

WHAT TYPE OF OIL DOES EVERYONE USE.DOES IT HAVE TO BE STRAIGHT WEIGHT OR CAN I USE 10W30 FOR MY RACE CAR VERSES 15W40, IM CONFUSED ABOUT THIS.

MAINLY OIL WEIGHTS ARE DEPENDANT ON HOW MUCH BEARING CLEARANCE U HAVE IN RODS AND MAINS...IF IT IS A STOCK REBUILD WITH STOCK CLEARANCES,USE STOCK RECOMMENDED WEIGHT OIL.IF IT IS A LOOSE MOTOR SET UP FOR RACING USE THICKER OIL LIKE 20/50


BRAD PENN IS KNOWN FOR ITS SLIPPERYNESS WHEN CONTAMINATED WITH GASOLINE(GREAT NEWS FOR NITROUS USERS)

I used to use 10w/30 but it was so thin my dry sump pump was leaking around the front seal.
I now use 25w/50 race oil. Some say I'll lose a little hp but I don't seem to.

10w30 full syn pennsoil

20/50 is a safe option, you do give up a few hp

15/40 ROTELLA

X2 on the rotela T 15/40,

15/40 schaeffers synthetic

I've ran 4 different oils this year, on alky injection with a primer plus

15/40 shell stuff looked good going in .. didnt look so hot coming out
20/50 & 10/30 vr1 -- little to no difference other then 5 hundreths on the track

and whats in there now is 5w/40 syn castrol, a buddy of mine did some r&d on this stuff, and oil temp is very good under hard use. So far so good.

10w30 Mobile 1 or Valvoline full synthetic.....