I am familiar with the regular devil. What is blue devil though as I live a sheltered life.

Seal expanders for automatic transmissions are basically oil products that expand the seals. The hydralic type oils used in automatic transmissions are totally differant than engine oils. So I easily understand why their seals expand. What expands seals designed to function with regular petroleaum oils is what interests me.

X2. Who is the blue devil and how do we contact him?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

blue devil is the brand name of a additive of coolant and motor oil to fix head gaskets and oil leaks, cd2 does the same thing.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800