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Thread: Synthetic oil in Onan
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Old 08-18-2021, 09:29 PM   #11
streamintrip
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Brand: Thor Motor Coach
Model: Tuscany 44MT
State: Texas
Posts: 16
THOR #22909
I use synthetic 5w30 on both the 10kwQD and the L9 450 hp Cummins main motor. I change both myself on an annual basis.
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2017 Tuscany 44MT;1,200 watts solar;600AH Lifelines
2018 Colorado Z71 Centennial Edition Duramax Diesel
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