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Old 01-11-2004, 03:38 PM
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fj bertrand fj bertrand is offline
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Join Date: Oct 2002
Location: North Central PA
Posts: 441
In my 84 300td at around 20 degrees I use the block heater and I use a mix of Rotella 15-40 and Mobil 1 0-40w,(50-50) car uses a quart about every 800 miles using this mix. using straight mobil 1 I use a qt about every 500 miles. leaks.

Other diesels I use Mil Spec 2104C surplus If I can get it. One of the highest TBN's available. It either comes 10w or 10w-30. It's a bluish color. Interesting stuff.
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