I guess the title says most all of it, I had been changing at 4000 on the standard diesel dino. Thursday I’m embarking on a 2000 mile round-trip. I put in Rotella T5 15/40 3400 miles ago. Not sure if 5400 miles is an acceptable interval.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K