Mobil 1 vs Mobil 1 Racing 4T

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FCD

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What are the differences? i think the 4T has more zddp but don't know about much else.
Are the additive packages the same in 10w40 and 15w50 form?
I was thinking of trying it out after VR1
 
It was one of the best oils years ago and one of the few remain "true synthetic" Then it wasn't that great after reform #1, don't know about currently. This was a 10 USD per Qt. oil!
Most mOb-Oil ones are only 20-30% PAO and or POA base. Buster has a link to SDS that MAY have some insight.
 
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here is excerpt of SDS for M1 0w30 racing, a "real" Synthetic.

1-DECENE, HOMOPOLYMER HYDROGENATED 68037-01-4 70 - < 80% H304
ORGANO MOLY-SULFUR COMPLEX 1 - < 5% H315, H317, H402, H412
ZINC ALKYLDITHIOPHOSPHATE 68649-42-3 < 2.5% H315, H401, H411
ZINC BIS(O,O-DIISOOCTYL) BIS(DITHIOPHOSPHATE) 28629-66-5 0.1 - < 1% H315, H318, H401, H411
ZINC DITHIOPHOSPHATE 68649-42-3 0.1 - < 1% H315, H318, H401, H411
 
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