I'm having trouble with this theory. If you do a full flush you are ALSO REMOVING all the crud that is already in there. That has got to count for something. With a drain and fill you arguable have half the fluid in there that is already fully saturated with crud so the full volume is only half as effective in the use of detergent. Am I wrong?
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2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles
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