I have a 1989 560SEL and want to change the transmission fluid and filter in the transmission. What type of oil should I use? Are there any surprises that I should be weary of? Will this job get out all the fluid or do I need to do more? Should I bring it into an MB independent shop to do this job or can I tackle it? I like being a shade tree mechanic, but will this job a little more than I can chew off?
Dexron III or above. Mobil-1 synthetic is compatible. Don't use ATF+4 which is very different. The job is not difficult but it is messy (just think laying on your back under the car and the fluid is dripping everywhere once the pan is removed).
jack up the car and place stand underneath. A drive up ramp makes this task much easier. Remember to block the wheels
Drain the fluid from the plug (using 5mm hex key)
Turn the torque converter in the direction of engine rotation until the drain plug is seen in the opening at bottom of housing. A long and big screw driver may help. Or turning the crankshaft (if you have the right size socket). Make sure the engine is never turned backward.
Drain from the torque converter. A hex key socket with short extension is better than a simple key here.
Remove 4 or 6 bolts (13mm) to drop the pan. Try leave one bolt at corner and slowly remove it so the remaining fluid in pan can be drained.
Remove 2 (or 3) phillips screws from filter
Installation is reverse. Tighten the bolts to spec. The gasket is soft rubber and will allow you keep turning the bolt without too much more torque
Put in 3-4 qts of ATF first. A funnel will help. Run the engine and shift through all gears while applying brake firmly. Stay in each gear position for a few seconds.
Then add another 3-4 qts. Make sure don't overfill. Slightly under fill is better than overfill.
Total cost is about $45 (gasket, filter, 7 qts Dexron III) and 2 hours
You can skip torque converter if it is difficult to turn engine, but remember that half of the fluid is in it. If you choose to wipe off the ATF to avoid dripping, make sure the wipe is lint-free. Any dirt in valve body will make it malfunction.
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