Quick question- How many miles do i need to put on a new built engine before switching to synthetic? I know the oil topic has been beat to death but can I get a professional answer? Thanks

 

1000-1500 miles..depending on how the engine was broken in. That's a good rule of thumb.

 

Thanks for the quick answer Shariff

 

why so low? Most people say 10,000 miles before syn. Is the built motor diff?

 

most likely your rings are basically set very early on - like in the first 50 miles. Things are still mating up, but after a 1000 miles, basically everything that is going to wear in will have done so. I usually switch over to syn at 1500-3000 miles -> whenever I feel like doing my first oil change

 

I went 1000.. on cheap halvoline/valvoline.. then syn..

 

i say 5000-6000 miles before the switch...




Ford or Chevy??

 

+1 5000 min.the better the ring,the more time needed.

 

I had 4 oil changes... then I hit 1500 and switched to synthetic

Goin on my 6th oil change and after this I'll start doing regular 3k mile synthetic oil changes.

 

there are a bunch of opinions and there are so many factors no one system is best,i try to err on the conservative side and when i hear "rings are 80% set by 1500" that's not enough,i want 100%.

 

+1 i have heard between 10-20,000 miles on the plasma moly's. the best theory i have heard that makes sence though is to do alot of coasting on the motor and it will load the rings helping break-in.

 

the only opinion that seems to repeat itself is to vary rpm and stay away from redline.2-stroke wisdom says take it out and beat the motor,but with 40hr ringlife i can't justify this technique on a 4-stroke motor.race motors get this same "beat on it" treatment but they get torn down either every race,at the end of the weekend or the low budget crowd tries to last the season.

 

im going 5000 on my car right now im only at about 3k for now im running rotella's diesel oil

 

good choice,why don't you just stay with rotella and forget synthetic all together.