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Historically, folks indicated that synthetics caused leaks in their vehicles. I do not believe this is true anymore, if ever (I changed my 1966 Corvair to synthetic. Based on legend how could I tell if synthetics caused leaks?). Go ahead and make the switch if you want to run synthetic.
Steve
So, are you saying you've switch to synthetic on a 66 without a recent engine rebuild? (new gaskets) and you have no leaks? I've always heard not to use synthetic on older cars (old gaskets).
Last edited by Vetter86; Nov 16, 2009 at 09:52 PM.
If the valves and the rings are OK then it should be good for synthetic. I tried syn blend in my S-10 a few years back and it smoked like crazy at start up.
In talking about the poll thing and stickying it, was an idea from a harley forum I go to. Its pretty neat seeing what percentage of people prefer a certain brand or weight (and why). I know some go with what they always used, what their father used, what they can afford or what someone else told them was good.
I'm sure racing plays an important part in choosing a name on the side of the bottle and patriotism (what country its made in). There are "laboratory" tests that say some are better than others (i can't throw the results at you). Mostly from experience a lot of bikers will tell you using amsoil will keep your bike up to 20 degrees cooler (but then we're talking about an air cooled engine).
Maybe some people think they're all the same, and perhaps a lot of oils are, but a lot of people feel nothing but the best for what they drive or ride. If you can extend the life of your engine why not upgrade to a better oil?
So, are you saying you've switch to synthetic on a 66 without a recent engine rebuild? (new gaskets) and you have no leaks? I've always heard not to use synthetic on older cars (old gaskets).
Corvairs are infamous for oil leaks from their pushrod tubes. They used nitrile rubber from the factory and almost all Corvairs would leak after several years of use. Normal maintenance on a Corvair, regardless of the oil being used, is to replace the factory O-rings with Viton O-rings. So, while the O-rings were new, other gaskets and seals, e.g. the rear main and front cover, were original. I have not had oil leaks on the Corvair that I would attribute to the switch to synthetic oil.
The Corvair is a poster child for using synthetic oil because it is air cooled and runs high head and oil temperatures. On the other hand, periodic cooling system maintenance is quite simple.