[acivichb]

I am finishing up my ej25 motor with just forged pistons and rods with a .05 overbore so its 100mm insted of 99.5.... I am using a stock headgasket and basicaly every thing else is stock.... I am just woundering what type and weight of oil will I have to use now????Thanks...

[Flycaster]

The fact that you swapped pistons and rods doesn't change anything. If you'd played with bearing clearances, then yeah, it'd matter. I'd stick in some 5w30 or 10w-30 dino oil for the break-in, change it a few times until the car has the final tune on it, and then switch over to a synthetic. As for brands, it's your choice - if you change your oil frequently (which you should) any of the major brands will do the job. It's just my opinion, but I think some guys get way too anal about this stuff.

[gabedude]

I use Shell Rotella-T 5w40 for my dropin piston motor. But its hot in Texas.

[acivichb]

ok thanks you guys well I did not do anything to the bearings except put acl race bearings but I believe that they dont change anything.... Well I live in Hawaii its really hot and humid here also... Thanks you guys...