Here are the results of my most recent oil analysis on my LB7 Duramax. It has 267,500 miles on it on what I believe to be the original engine. This oil has ~5700mi on it. I have just taken another sample a few days ago at 267,510mi (7510mi on lube). It is Amsoil HD Diesel Marine 15W40 with an Amsoil EAO 52 filter.
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