<VV> Selecting an oil

[Bill Elliott]

Here's some history for you.  Short version is that Mobil 1 and Amsoil 
both used a synthetic base and in the early 90's Castrol figured out a 
cheaper way to make a semisynthetic base that ended up with a similar 
performing oil. Mobile sued to keep them from calling it "fully 
synthetic", lost, then changed their own formula to the cheaper base. Or 
at least _some_ of their oils... it's kind of unclear.

http://www.technilube.com/sections/comps/synth_diff.htm
http://www.v8sho.com/SHO/Mobil1.htm

The good news  is that ANY of these oils (whether you consider them 
"fully synthetic" or not) are just fine for your Corvair and will FAR 
outperform any nonsynthetic oil. Most folks agree that Amsoil is the 
best; the question is whether it's worth the additional cost.

I change my oil every 5000 miles (or more usually twice a year) and for 
the last few years I've been very happily running Castrol Syntec 5W-50.  
Amsoil in the transaxle though.

Bill





Mikeamauro at aol.com wrote:

> 
>"...Thanks Ken every motor I have runs Amsoil and has for 20 + years. But  we 
>know 
>why! Thanks Jack..."
>
>
>What's the skinny on Mobil One? I  know it is not as good as Amsoil, and 
>probably is not a true synthetic, but does  it have the right "stuff" (relative to 
>recent changes in many motor oil's  anti-wear ingredients) to protect Corvair 
>engines?
>
>Thanks,
>Mike Mauro
>
>
>
>  
>


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