Join Date: Dec 2008
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We run Amsiol in all of our trucks from a 97 7.3, 7-(6.0) and my new 6.4
we sample the oil @ 20K and Amsoil says to keep running the oil .
Most of the time we change @ 30,000 miles.
If you check into the web site the oil is worht it.
we have approx.1,200,000 miles on these units with no oil related problems.
I run amsoil in both my bikes and 2 boats along with all engines around the house.
we do mostly highway miles pulling a 300 series bobcat or a small roller with these units. 2 of these units have service beds with welders & compressors on them also.
synthetic oil is the way to go.