I rebuilt my Vortec 350 about 5,000 miles ago. I now run full synthetic 10w-30 Castrol oil and have replaced all of the gaskets including the rear main seal. Despite this, I still spit about 1 quart every 2-3 weeks.

HELP???

And no, I really would rather not pull the motor back out.

 

spit?? where does it spit from?? does it leave spots on the driveway??

really need more info

 

I cant see exactly where it is dropping from, but it seems about at the rear main. It's dripping off the rod that's connected from the back of the motor to the trans. It's dripping down onto that then dripping onto the ground. It's just frustrating because I replaced all the gaskets in the motor when I rebuilt it about 6 months and 5,000miles ago. I imagine that running full synthetic oil that's thinner that it would get through some seals at first but it should be done by now.

 

Can you see the back of the intake? If you didn't seal that good then the oil could be leaking from there.