Thread: kendall 20/50?
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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
 
Join Date: Jun 2008
Location: Detroit
Posts: 948
Amsoil is pretty far behind the technology curve at this point. The main players spend a lot to stay ahead.

Mobil 1 and Rotella T6 have about the same ZDDP, and the diesel oil does not have the high rev anti foming additives as an automotive oil.

Go full syn. Using 20W50 is fine down to 30F (-1 C).
Old 11-04-2014, 02:18 PM
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