when i first pruchased the car a month ago or so i did the tune up bit and b4 i was aware of what synthetic could do i.e. create new leaks. so i was wondering if there was something different involved in going back to conventional oil castrol gtx 10-40. i live in WA some advice would be great. i am in the process of power foaming as we speak and thought i should change my oil since my wife has been driving with me and flooding and stalling.

 

As far as I know theres one rule about doing what your talking about, and that is once you go synthetic, you cant go back. That is why they have synth-blend so you can go from regular to better blend and back if you like.

 

and why can't one go back???

 

ive never heard of that. it has only been in for a lil over a month about 1500 miles. i would see somthing on the lines as draining syn. filling with some cheap **** run it an hour or less then drain and fill with desired oil from there, or even a motor flush bottle in the old oil then desired oil.

 

I switched back and forth from full syn to el-cheapo **** in my shadow all the time.

Unless there's a specific reason you can't switch back on a rotary, I don't see why it would matter. They're both supposed to blend together and be compatible.

Just switch back, and get your next oil change a little sooner (like half as long a time) to be on the safe side, but I wouldn't worry.

Jon

 

Unless you premix, you shouldn't use synthetic anyway.

There are absolutely no problems with switching back to regular.

 

cool thanks i went ahead and changed my oil a minute ago. i just thought i might ask first.