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Old 04-10-2008, 09:27 PM   #20
bluesubie
Scooby Guru
 
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
Vehicle:
04 FXT

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I'm not JnJ, but I'll speculate.

Diesel oils, in general, have a higher level of anti-wear additives like zinc and phosphorous. That's why so many are switching to Rotella. Amsoil's 5W40 is actually on the thin of being a 40 weight, while the diesel oil has a thicker viscosity when hot. The diesel oil also has a higher High Temp High Shear.

Compare viscosity at 100C and HTHS:
Amsoil Diesel 5W40 .
Amsoil Euro 5W40 .

-Dennis
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