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A few on-line sources of info:
Paradise Garage is doing a long term study of synthetics. They had some viscosity problems with Amsoil. Mobil 1 passed with flying colors. Go to http://neptune.spacebears.com/cars/stories/oil-life.html
"Bob Is The Oil Guy" has some comments about Amsoil. You might want to check them out at www.bobistheyoilguy.com. Not everything Amsoil sells is API licensed. Bob has some thoughts on that and the problems it might cause.
Most of the on-line testimonials of Amsoil are actually "dealer" advertising.
I don't know that Irv Gordon ever used synthetics in his 2,000,000 mile Volvo.
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