Really....?? and that's because you are one of those guys who are smarter than the engineers who designed the engine and spent countless hours testing them... RIGHT? :sidelaugh: :sidelaugh:Snotrocket said:I run the 15-40 in my engine without any problems.
But what type of oil did you run in your BR 549 Bob. :thumbsup: :sidelaugh:Bob MacGregor said:I ran two P218s with 15W40 in warmer weather and 5W30 in winter. Did the same with my B48 for years.
Mad Mackie in CT :mrgreen: :mowlawn:
Hi Mark,oleblu72 said:I run Chevron Delo 400 15/40 in my Mack I was thinking about running that in the 448.