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The best UOA I ever got out of my 99 GMC 6.0 was with 15-40 delo 400. I switched to Mobil 1 delvac because I use a bypass filter on this truck, and I thought the delvac would filter better through the bypass. The lead levels (still low) are slightly higher with the delvac. I may switch back to...

Ken2 Every manufacturer that will post their #s still lists their deisel engine oils at about 1.3 to 1.5 on the zinc and phospherous. This is even though they are using the SL designtion. I have always understood that only the lower viscosities (5-30 and 10-30)must have the 1% limits in order to...

I don't run 5-30 in anything I own. My Wife's Saturn (01SL2) gets 5-40 Delvac 1, and I change it every 10,000 mi. Car only has 47,000 on it, but has not used oil between changes. I believe that 5-30 is strictly for CAFE requirements, and the EPA forced the reduction of Phosphorous and Zinc...