Natural to Synthetic Oil, any complications? Options

[hurley97]

I've always used natural oil because thats what I assumed the previous owner used. I want to switch to synthetic but I've heard bad things could come from doing so after using natural for so many years.

I can't remember exactly what possible problems I was told could arise nor can I remember where I heard it but it had something to do with the deposits that form and casing leaks, etc.

Is this just a myth? I plan to just flush the system like I did when I switched weights, would that have any negative consequences?

[eggman40]

I dont know if it would matter for our cars, but I work at a Motorcycle performance shop, we do all sorts of engine work from piston kits to port polishing and other head work. We dont recommend our customers to use synthetic oil simply because at high revs 10K+ its hard for the oil to stick to the crank sometimes starving the journals of oil. In fact some of the parts we use like Web Cams and our APE valve springs, we wont warrenty a motor that was run with synthetic.

I see that people have used synthetic and have had no problem so I assume this problem will not transfer to out low reving motors, but I still wont use it. My motor has 75K + miles and i would rather have a thicker lubricant in there. Just my opinion, not shuning anyone elses.