Running 7,000 on Amsoil Syn oil and filter. I towed the 5er about 15-20 trips of varying lengths this season. My off-season will not be much more than 7,000 miles so I'll probably just stick with that all year long.
Just replaced trans. fluid/filter and diff. fluid at 21k. A bit early but wanted to do it now, at the end of my first season pulling with the new truck rather than wait til 28k.
Did Blakstone oil analysis at 14k and 21k sample is in the lab now.
What intervals are others that tow doing for their trans/diffs?
Jim
On Edit: I've attached a copy of one of my Blackstone Labs reports.
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Jim
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