Man oh man be careful. It the oil cooler lines have never come off before they will in all likelyhood be siezed on the aluminum threads of the oil cooler. Once you take off the old oil cooler lines the resulting threads are usually shot. You can do it if you are mighty careful but why bother? Just change your oil every 1000 miles for a few months and your done. (my .02)

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Orland Park, IL
1985 300SD 215,000 miles