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Rick:
Just for your info and I don't have all the facts but this is what I remember. Some years ago, don't remember exact one, Mobil sued Castro over the fact that Castrol was marketing an oil advertised as synthetic. Up to this point, I believe, the only synthetic oils on the market were full synthetic. The courts decided that as long as the oil was more than X % synthetic but not 100% synthetic, it was OK to call it synthetic.
The MSDS that doyall put in the first post is the only true indication of what's what. You're right though, it is a never ending subject with opinions about as numerous as ................... As far as I'm concerned, any synthetic (regardless of %) provides more heat protection than regular dino oil. I've pulled cylinders on Evo's with over 100,000 miles using HD 360 oil and still see the crosshatching on the cylinder walls so there's no argument that dino oil works but it still doesn't provide the heat protection and kling properties than synthetic does.
__________________
Ed Y
99 FLHT (carbed)
I yam what I yam.
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