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#1
03-29-2007, 04:42 PM
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Transmission myth?
Its been at least 5 years since the PO replaced the transmission filter in my '83 300D.
Non-mechanically inclined people have been telling me not to replace the filter due to the age of the car. Their reasoning is that with a new filter the pressure will increase inside the transmission and destroy it. Sounds like an automobile myth. Is there any truth to what they're saying?
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JWJ 1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG 1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG Biodiesel, Mobil Delvac 1, and Viton fuel lines! 
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#2
03-29-2007, 04:49 PM
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Clean filter has better flow rates, and decreases the pressure needed to move fluids through the filter.
Better flow means better lubing and fluid dynamics all around. Sometimes new fluid will clean the crap that was holding the almost bare clutch packs resulting in slipping. Regular maintenance (fluid AND filter change) prevents the prior scenario and keeps the clutches, bands, valves, TC, oil pump, etc very happy.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#3
03-29-2007, 04:57 PM
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Quote:
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1980 300D
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#4
03-29-2007, 05:01 PM
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its common sense.. a old oil filter will collect debris. thats what its for.. that debris in the filter will cause a restriction in the oil passing thru the filter. any restrictions will cause pressure increases. just my .02 so do what you wish
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1983 mercedes benz 300D turbo diesel. pyrometer, boost/vacuum gauge exhaust dump pipe turbo- 15 psi boost. 25 psi capability disconnected EGR
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#5
03-29-2007, 05:07 PM
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Remember he has a "maintenance free" filter, that all you have to do is drain and clean...seems like maintenance to me! Of course not changing the tranny filter on a Lovecraft car then puts tranny failure as the cause for the car being sold for scrap instead of his cold WVO system... 
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#6
03-29-2007, 05:31 PM
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Quote:
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1980 300D
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#7
03-29-2007, 06:18 PM
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Even Mercedes claims to this very day that no transmission servicing is required for the 722.6x'.
That doesn't mean that its right.
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#8
03-29-2007, 08:49 PM
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Quote:
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#9
03-29-2007, 09:13 PM
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first thing i do whenever i buy a used benz with an automatic is change fluid and filter.
i cannot see any downside to it. clean fluid, clean filter. i have also gotten some which were shifting funny to come out of it. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#10
03-29-2007, 09:34 PM
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Change it.
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#11
03-29-2007, 10:07 PM
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Quote:
Last edited by DslBnz; 03-29-2007 at 11:45 PM.
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#12
03-29-2007, 10:44 PM
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Service it.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#13
03-29-2007, 11:27 PM
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My 85 is now in a trannie shop & may need a new one
I changed the fluid & filter about 10 mos ago. properly The old filter was real dirty. the fluid was pink. At the time the trannie had a minor knock from 1st into 2nd.. After the change the knock got noticably worse. The fluid level was fine. Well last weekend something else was real noticeable. MY car won't go any faster than 35 MPH and stays in 2nd or 3rd gear..... A long time ago a mechanic told me to not change old fluid or filter because it builds up a varnish of sorts that the transmission gets "used to", andif you change it you will ruin your transmission. I believe him now. I was just going to start a new thread asking if anyone had any trannie advice for my D. ...
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'87 924S '81 280SEL Sold -> 81 300SD - 93 300E w/ 3.2 85 300D- 79 300SD 82 300CD 83 300CD - CA 87 190E 5 spd 87 Porsche 924S "..I'll take a simple "C" to "G" and feel brand new about it..." 
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#14
03-29-2007, 11:59 PM
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Quote:
Change the fluid.
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01 Ford Excursion Powerstroke 99 E300 Turbodiesel 91 Vette with 383 motor 05 Polaris Sportsman 800 EFI 06 Polaris Sportsman 500 EFI 03 SeaDoo GTX SC Red 03 SeaDoo GTX SC Yellow 04 Tailgator 21 ft Toy Hauler 11 Harley Davidson 883 SuperLow
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#15
03-30-2007, 12:07 AM
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You can always just drain a quart of the old. Replace with new. Drive around. Drain a quart, replace with new. Drive more. Repeat for a while to slowly get the build up out that could potentially be in there
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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