hey guys i have a question. in the morning when i go to start up my 55 buick it appears to be really rough when it fires up. it's almost like there is no oil in the engine, although there is plenty of oil. i talked to someone who said that the oil probably doesn't stay where it needs to be overnight. he was also saying that the original oil canister doesn't have an anti-flow back for the oil pressure like the aftermarket spin on types. so if i could have some info or input on this subject it would be great! P.S. it only is rough for about 10-15 seconds.