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[Toban]

I notice that much is said about the quality of fuel and lots of time idling with regards to the coking of the 6.0L. There hasn't been any mention, or very little about crankcase oil.

How much of a role does the motor oil have regarding the coking?

The reason why I am asking this question is because of all the reading I have done on EGR problems, maintenance and advice, I am now contemplating using Amsoil on the next oil change. Amsoil puts some emphasis on the fact that their motor oil has a "12 TBN" - (Total Base Number (TBN) is the measurement of a lubricant’s reserve alkalinity for combating acids).


AMSOIL - Synthetic 10W-30/SAE 30 Heavy Duty Diesel Oil (ACD)

PRODUCT DESCRIPTION
AMSOIL Synthetic 10W-30/SAE 30 Diesel Oil (ACD) is formulated with premium synthetic base oils that exceed both 10W-30 multi-grade and SAE 30 straight-grade viscosity requirements for outstanding performance in modern and older diesel engines. Unlike conventional SAE 30 motor oils, AMSOIL ACD has a naturally high viscosity index and does not contain paraffin (wax). It has a -36°F pour point and qualifies for SAE 10W, making it an “all season” multi-grade lubricant with a wide operating temperature range. AMSOIL ACD is formulated without viscosity index improvers (VI). This shear stable formulation stops viscosity loss and associated bearing and cylinder bore wear. AMSOIL ACD contains premium additives with a high 12 TBN to neutralize acids from blow-by, exhaust gas recirculation (EGR) and high sulfur diesel fuels. It protects against damaging piston deposits, ring sticking and sludge.