Quote:
Originally Posted by BillGrissom
I think the issue with diesels is much more carbon buildup in the oil. The main difference in diesel oils is more detergents to suspend the carbon. Thus, the main reason for regular oil changes is not that the oil has chemically broken down, but rather the carbon load is too high. If true, I would think regular oil changes of mineral oil at 4000 miles is better than running synthetic oil for 7500 miles. Most gas engines now have optical sensors which measure how dark the oil has become to flag a change. Probably wouldn't work on a diesel because even after the first day of driving my new oil looks blacker than in the least-maintained gas engine.
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This was a thought I kept coming back to. I went from '02 to '16 using mainly BMW E30 325i (s plural, not sport) as daily drivers. Going 7k on synthetic makes more sense with those than with a diesel.
I found some Rotella T5 15w/40 at a WalMart for $18 a gallon, I can get a WIX filter at O'Reilly's (I have a Mann at home, I'm still 750 miles away, can't get a Mann off the shelf here). My impression is that WIX are generally good filters, I'm going to try to change it at my nephew's house today. I'm at 5036 since the last change.
I appreciate the feedback, I get that this topic is often an area of some dispute and controversy.
05-22-2018, 09:52 AM
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