Transmission cooler lines are not known for failing on these cars. Engine oil cooler lines on the other hand, are well known for failing and destroying the engine in the process. If the mechanic was talking about engine oil cooler lines, they are well worth inspecting closely. Transmission cooler lines are metal and generally reliable except where the metal brackets attach them to the engine(?). The brackets can rub through the lines.

Good price on the valve adjustment.

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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