5.0sTheWayToGo

When i got my 331 built i put mobil 1 synthetic motor oil in the car. I heard its not good to do that on the first oil change because with the sythetic oil it doesnt allow the rings to seat? anyone know anything about this? i do get smoke out of my exhaust so im wondering if thats whats going on. Will it hurt my car if i go to regular motor oil for 3000 miles?

2 kwik

well first about a few 100 miles is when the first oil change needs to be on that rebuild....so change it and put in some quality cude oil

Twisted

+1. Go back to crude, and hope that your rings seat. Good luck.

gspfunk

Yup...synthetic shouldn't be used until after the break in. Also, on a new motor build, you should change the crude every 500 miles or so to be safe. Not 100% necessary, but will save you any heartache if you catch problems early.

92stang302

do not us sinthetic on first run or any thing becuze it wont let motor break in right a good brak in oil is vavoline 50w race

mustnglvr

i would use 10-40 if i was u. 50 takes to long to circulate

5.0sTheWayToGo

well its to late.. i have already put like 2000 miles on the motor using nothing but mobil 1 synthetic.. should i go ahead and try using 10w 40 anyway and see what happends?

mustnglvr

What sythetic are you using 5w 30?

5.0sTheWayToGo

10 30. why?

mustnglvr

Your fine with mobile one synthetic for breakin its better that conventional.You went with a good choice