Most if not all heavy duty vehicles don't have an oil life indic

We typically send fluid samples in for analysis periodically, such as Blackstone Lab and CAT dealers.

Gasoline vehicle is a different animal.

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• I have sent my more than a year old but 5700 miles -MoonRiverMe- ♂ (73 bytes) () 04/15/2020 postreply 17:10:00

• 5700 miles was low and just a little over a year. It's fine -老生长谈- ♂ (185 bytes) () 04/15/2020 postreply 17:21:31