Charles, it would be enlightening to see the MSDS's on these products. I wonder if anyone has tried the Rotella DFC. Just spotted it at Wal-Mart but it seemed pretty expensive; I believe they said to use a full bottle (~$6) with each tankful. More than Redline DFC, if I read the bottle correctly. (I didn't buy any.) BTW, Pep Boys did have the Redline Water Wetter on sale for less than $5.

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic