Yes, I read about the sludge thingy here in MT some time ago.... Personally, I wouldn't waste my time or money on it. Diesel motor oil gets dark because of an accumulation of soot. Diesel fuel these days is usually less than 10-parts per million sulfur. It's not sulfur than darkens motor oil used in diesel engines.Originally Posted by Michael D.
I've taken aparts enough high mileage 6.2/6.5 diesels to know that if you change oil every 3000 miles or so, there'll be little to no oil related buildup anywhere inside the engine. The 6.5 I pulled down a while back had zero accumulation. The 6.2/6.5 needs its oil changed about every 3,000 miles because of the gradual soot accumulation in the oil.
The Delvac 1 used in my 2001 Duramax stays honey colored over 7-8K miles at its yearly service. The Castrol synthetic used in my daughter's 2005 Chevy Equinox's V-6 stays honey colored through its yearly service as well. Not doing anything special otherwise.
Jim
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