Pre-Mix

[dudemaaan]

Originally Posted by rx4ur7

I will stand informed then. I will still check with a manufacturer that they will guarantee it's use. Would like to see a street motor after miles of use.

My only other issue with it is it's ability to find a place to leak, when put into application that had been using petroleum. Has that been addressed?

Thanks.

I'm not sure. I know a lot of guys have been running synthetics without problems. A lot of the big shops like pineapple recommend synthetics. The only issue I know of is it slows the break in process due to reduced friction. It's been suggested to break in on regular oil and then switch to synthetic.

I've been running synthetic now for a year or so, (switched, no leaks) but I'm not convinced the cost is worth the benefits. It might be better to run standard oil and just change it twice as often. The upside to synthetics is reduced friction, lower operating temps, and doesn't break down as easily. It also doesn't coke up on turbo bearings as easily which can be a problem on oil only cooled turbos..Most guys running synthetic are running lighter oils (5/40, 10/40) which could be why some experience leaks? I'm running 15/50 and have no problems with it.

The older oils had high amounts phosphorous (bad for o2 sensors and cats) and a high ash content, (higher carbon buildup)

All synthetics that I know of now have to at least meet the API "SJ" rating, which specifies low content for both phosphorous and ash.

I would be more concerned in finding an oil that has not fallen prey to the reduction of zinc dithiophosphate or ZDDP which is a friction reducing additive. The new "environmentally friendly oils" have reduced this additive because it's shown to reduce the effectiveness of catalytic converters over time. By reducing the additive, engines wear out faster, especially engines under more stress. (high performance engines)