Switched oils

[Big Jim]

Zink is filthy, ugly stuff. Unless you have an engine with flat tappets and more than stock valve spring pressures, you don't need high levels of zinc. Other additives do the job much more cleanly, such as moly.

Zink has been cut back partly to help keep things cleaner (less combustion chamber deposits, less build up on valves, less intrusion on valve seats) and partly because zinc eventually poisons catalytic converters.

 

[Head]

Forgot to mention, I also use Motorcraft semi-syn in our freestyle since it is cheap, good quality, and we don't drive it near as much as our CSVT. (wonder why...)

i used this on my FSVT and my blazer for my last changes and everything seems fine so far; i was using mobil 1.

 

[Jkckchilli]

A couple of years ago i read something about what oil was made up of and the real difference between regular oil and synthetic oil, according to experts and some of my further investigation the difference is that conventional oils are made up of long and short fibers, and through the process of your engine's driving it slowly burns off the short fibers which basically gets your seals used to that type of oil, and the seals need that oil. However, synthetic oil is made up of only long fibers, which dissallows the seals to get their "fix" of the short fibers, which creates those leaks, or stronger leaks in engines that have switched to synthetic from conventional, however it is completely safe to go the other way synthetic to conventional and has been proven to be better for your engine to have conventional oils, and not to use synthetic...