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Rotella T-6 synthetic is all I use in my 6.7. I have the dealer change at 6k intervals, at 18k miles already and the engine does not use a drop between changes.
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Indian Springs Farm
2018 3121RL Samsung Residential Fridge
2018 Ford F250 PSD Air Lift 5000
Sailun 637 tires Predator 3500 (2) paralleled
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