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Prestone Full-Synthetic American Powersteering Fluid #5441192 05/28/20 05:51 PM
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blufeb95 Online Content OP
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I had a peek at the SDS because this is what's recommended for my 08 Trailblazer, it appears to be mostly PAO with some esters and a few other adititves.

Component CAS No. Amount
1-Decene homopolymer, hydrogenated 68037-01-4 10-80 %
1-Decene trimer, hydrogenated 68649-12-7 10-80 %
Hexanedioic acid, ditridecyl ester 16958-92-2 3–7%
Zinc and Zinc Compounds Proprietary <1 % Phosphonic acid,
dibutyl ester 1809-19-4 <1 %

Re: Prestone Full-Synthetic American Powersteering Fluid [Re: blufeb95] #5441313 05/28/20 08:35 PM
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sloinker Offline
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May be 20% with some ester < 4%. Hard to say with the vast amount of variation called out in the sds.

Re: Prestone Full-Synthetic American Powersteering Fluid [Re: sloinker] #5441356 05/28/20 09:28 PM
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blufeb95 Online Content OP
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Originally Posted by sloinker

May be 20% with some ester < 4%. Hard to say with the vast amount of variation called out in the sds.


In my experience if a Prestone product contains mineral oil it says so on the SDS, the full synthetic Asian Power Steering fluid says it has 30-60% highly refined petroleum oil in it and 5-40% of each PAO compound.

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