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OK, so I happened to be near the GM garage that had some SC oil in stock.
Looks like the Amsoil rep. was right. SC oil is ester based.
The GM oil Part#12345982
"Contains: Fatty acids, C5-10,esters with dipentaerythritol-
Phosphoric acid,(1,1-dimethylethy)phenyl diphenyl ester"
I bought 2- 4oz bottles for $22 Enough for a change and then some.
I feel confident that this will be as good as the OEM stuff.
Grandpa
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