I can pick up a "kit" consisting of a bottle and mailer at the local Caterpillar dealer for $9.50 (last price was a couple years ago). Probably the cheapest, may not be the best.

Performance Analysis, 1345 Oak Ridge Turnpike, Suite 258, Oak Ridge, TN 37830 also does oil analysis. Don't have the price handy, but I remember $35?

They also have all sorts of other stuff, including climate control servos for the W116. Pretty pricy, but aluminum instead of plastic so they don't crack.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!