I've been using Rotella T5 for a couple of changes on my 300SDL. I'm at 3700 since the last change now, need to head north for a family issue soon, about 1500 miles. I've heard of swapping the filter early to get more life out of an oil change.

Any thoughts on the usefulness or otherwise of that?

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Te futueo et caballum tuum

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