Is it better to stick with what been running in the engine (10W30) or would changing to a synthetic be better or not.thanks.....

 

For an old high mileage engine, I'd suggest staying where you are. Under 70K miles, a change to synthetic would be only slightly benificial to gas mileage, and cold startup/winter driving. Really hard to make up the cost difference. Age of the seals and gaskets will also make a difference. Synthetic is known to search and exploit leaky gaskets and seals in it's search for freedom

 

I just changed over my winsor, but took the precaution of installing new gaskets on oil pan triming cover, valve covers and intake, so far no leaks.

 

so basically. The good time to switch an engine to Synthetic is when you rebuild it.

 

No, No, No....You have to wait until you break-in the engine and seat the rings before going to Synthetic. Some say as long as 12,000 before switching.

Cheers.....[sm=icon_cheers.gif]

 

oh ok. Thats something good to remember.