1998 e320 722.6 Transmission Fluid & Filter Change. Should It Be Done At All?
 

I have a 1998 e320 with 188K miles and a 722.6 transmission. I have heard stories over the years that Mercedes made a mistake by saying these transmissions never need a fluid and filter change. I also hear "experts" say that if there is no problem with the transmission, don't touch it because changing the fluid could cause problems. So, who's right and wrong?? Please don't come up with a political answer and say both answers are correct. There is a slight slip from first to second gear, but if changing the fluid could make the situation worse I won't do it. How could these transmissions be so sensitive?? I don't get it. Does anyone have a good, logical answer??

Change it and make sure you use the correct fluid. Also, on this application, the conductor plate may eventually need to be changed when it starts doing weird things while shifting.

From 2000 on it doesn't matter, older ones, yes, but there are tranny shops that will make up a batch of new oil with the same or close too, what is in there now.

I use mobil syncthiec for my 722.605 No problems since 2009. Did have front seal replaced when I put a newer motor.Never changed electrical plug,but drilled holes in coffin box in case of wicking.

The 98 e300d I took my motor from sure had some crazy looking fluid in the trans. It was green and resembled oil more than trans fluid. Really had me confused for a few minutes thinking it had an oil cooler in the radiator. It could've had some tranny in a bottle additive I suppose.

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You definitely can Change it and wouldn’t come up with any issue if you use the correct fluid.

Yeah Perfect Fluid [emoji106]

If anyone would like to see a comprehensive 722.6 trans filter & fluid service, Mike's Mercs and Other Cars has shared a handy DIY guide.

Preview (46 seconds): PREVIEW: Mike's Mercs and Other Cars - Mercedes R230 - DIY Automatic Transmission 722.6 Service
Full video (20 min): Mercedes R230 - How to change transmission oil & filter + electrical pass through O rings.

URO Parts list for R230 SL55:

• Transmission Pan 1402700812
• Transmission Pan Gasket 1402710080
• Transmission Filter 1402770095
• Transmission Dipstick Tool 140589152100

Other items:

• Wiring Harness Adapter 2035400253