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My Cummins 11 Litre M-11 has 50,000miles. Is there ANY advantage to 'blending' some Rotella Synthetic with the 15W-40 I now use?...Say maybe 20%Syn and 80%mineral oil 15W-40? Locomotiveman

JOHNNY, Engine Oil in the Cummins M-11? Shell Rotella. Allison 4060 Tranny? Dunno. I bought the Motorhome used and I am doing a change-out of ALL the fluids. QUESTION: So why IS there different weights of synthetic oil for differentials? Locomotiveman

Thinking of Mobil 1 Synthetic in my Dana/Spicer Motorhome Diff. w/32K Gross weight and Cummins 11 Liter engine. Why would one choose 90 weight over 140? Simply better when cold? Or am I missin' something? Locomotiveman

I intend to switch to Mobil 1 Synthetic75W90 in my Motorhome differential. Any need get ALL the original gear lube out? Locomotiveman