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Thread: L5P: Rotella T4 15W40
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Old 03-25-2020, 12:05 PM   #7 (permalink)
Low Boost
Join Date: Mar 2019
Location: Solon, Ohio
Posts: 8

These guys -- 6.6L Duramax Engine Oil Change| Oil Selection Guide & Oil Change Procedures -- seem to be convinced that Amsoil heavy duty 15W-40 full synthetic is the only way to go, but maybe Amsoil is a paid sponsor of their site?

Anyone else have experience with Amsoil or any other full or partial synthetic oil?
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