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Depends on the year, the older trucks all had external filters also. I think 94+ only had in tank filters.
My bad. I thought only 89-91 had an external filter. Then again, i don't know what year his Dak is, so everything I said up there was basically referring to a 1995 318 4x4.
Nice, lots of good info in this thread. Definitely getting ready for that big tune up. The truck is a 1990 with 3.9 and 5 speed MT. Still pulls really strong, hopefully better after I get everything freshened up.