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OIL CHANGE + 1800

posted by  Phil S. on  Mon Sep 1 06:27 CST 2003
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

Roy,

I don't know... are modern oils even rated as detergent or non-detergent?

I don't think the ODs are nearly as picky as some suggest, although I'm no expert on seal chemistry or whatever. I'm running ATF in the M46 (JP-type OD, I believe) because that's what's stamped on it. In the M41 J-type I use 80/90 hypoid gear oil. In the M41 D-type I've used gear oil and 30W motor oil, and I can't tell the difference. I recently had some problems that could have been viscosity-related, so I tried 20W/50 oil. Problems turned out to be electrical, but it seems happy with that so I'm leaving it in there for now.

Both types of motor oil have been Valvoline racing oil, which I bought on a whim, thinking it might be more durable than "regular" motor oil, as it doesn't get changed often. After several years and many thousands of miles, both M41s have stayed spotlessly clean inside. Can't say about the M46, as I've never had occasion to take it out of the car (knock on wood).






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