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I am using Rottella T in my 440 Motor with about 1500 miles on it since rebuild. I heard that Rottella T is best for flat tappet motors. But I recently heard that it causes sludge build up. When I had the valve covers off every thing looked fine. I only drive about 700 miles a year. And change the oil once a year. Should I change to another oil or use the regular 10-40 modern oils with a separate zinc additive?
Modern 10-40 with zinc additive. Most ( if not all ) new - 2010 diesel engines are going to after treatment ( convertors ) to meet new diesel emissions specs, so you can scratch using diesel oil for the hi zinc content shortly.
Last edited by Crizila; 05/09/09 03:29 PM.
