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Old 02-26-2013, 02:08 PM   #1
hipcat58
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Join Date: Feb 2013
Vehicle: 1985 300SD
Location: Woodbridge, VA
Posts: 1
Transmission fluid exchange on '85 300SD

Hello, gang. I just inherited a 1985 300SD. Been sitting in a garage for nearly four years. It has nearly 112,000 on the dash, but runs great. The transmission shifts a little rough, but that's to be expected because of the car's age and inactivity. My question: Should I change out the transmission fluid and filter? I've talked to three shops today and, of course, a couple of them are ready to flush it out ... but don't do the filter service. One guy said if it wasn't done before 100,000 miles, don't flush or change the filter because it could hurt the transmission. Sediment, I suppose. Like I said, the others are ready to flush through the dipstick but don't do the filter service. Guess very few shops drop the pan these days. What should I do? Ideas would be appreciated. Thanks. Hipcat58
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Old 02-28-2013, 05:11 AM   #2
rocky raccoon
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Join Date: Nov 2009
Vehicle: 2008 E320, 1988 560SL, 1983 300CD
Location: Greater Metropolitan Beaverdam, Virginia
Posts: 10
By all means

drop the pan and change the filter. A flush will not hurt either. Don't forget the torque convertor (separate drain plug).

Your shifting issues are probably due to vacuum problems. Check your shift modulator and inspect your vacuum hoses and connectors for old age rot.
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