MaxLife 722.6 Long Term Report - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 02-19-2014, 07:10 PM Thread Starter
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MaxLife 722.6 Long Term Report

111,000 - transmission slipping begins

121,000 - transmission rebuilt with 236.12/3353 fluid fill

130,000 - fluid flushed with MaxLife

I've driven 55,000 miles with MaxLife, and I've dropped the pan three times and removed the valve body twice, always carefully refilling with Valvoline MaxLife ATF.

1) MaxLife will NOT destroy your 722.6, in fact the new lower-viscosity formula makes the car shift quicker, preserving your clutch material.

2) MaxLife has an EXCELLENT detergent quality. My valve body was clean and even cleaner the second inspection.

3) MaxLife is not your best choice. The new lower-viscosity formula makes for some rough shifting, which is uncomfortable and bothersome.

I will recommend MaxLife to someone who buys a used car with no service history. Use it as a flushing and cleaning fluid for 10,000 miles changing often. Then switch to the Febi fluid.

The Febi still has the old 236.10 part number on it, and is labelled as a direct replacement for the original 236.10 fluid.

The car is shifting quite nicely now. I plan on doing a drain and refill every 10,000 miles with a pan drop every 30,000. Since I can't drain my torque converter, and my rebuilt unit is getting old, I want to do my best to keep the fluid as fresh as possible.

I am not considering using the 236.14/3414 fluid due to its low viscosity. The 236.12/3353 fluid is even lower viscosity, which prompted my switch to MaxLife.
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post #2 of 13 (permalink) Old 02-19-2014, 07:23 PM
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Another sample that those transmission are not as sensitive to different fluids as some like to think.
That beside the fact that they can really run 200,000 miles on factory fluid.
Still unless you are ready to take consequences of the action - better stick to the Mercedes recommendations.
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post #3 of 13 (permalink) Old 02-19-2014, 09:07 PM Thread Starter
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" Still unless you are ready to take consequences of the action - better stick to the Mercedes recommendations."

My 722.6 failed at 121,000 miles with factory fluid because the original owner followed the MB recommendation of never changing the fluid. MB has never withdrawn that recommendation. They also never issued many fluid approvals under the 236.10 spec sheet, specifically because it was "sealed for life". By your own admission, you acknowledge the 722.6 can fail before 200,000 miles, and then you give no guidance as to life expectancy past 200,000 miles. My car is at 14 years and 184,700 miles. I do not plan on retiring the car. Your advice is insufficient at best. It should be disregarded by any future reader as sophomoric. The 722.6 requires transmission fluid changes. Period.

After the rebuild, the transmission was filled with the 236.12 factory fluid, which created the problem of harsh shifting. I was, in fact, living with the negative consequences of sticking with the Mercedes recommendation.

When the 236.12 fluid became 236.14, MB never said why. At least in the 722.6 it created crappy shifting. It had 6.2 viscosity at 100c, and the new 236.14 has 6.5. When I switched to MaxLife it had higher viscosity, but it is now at 5.9 and also shifts crappy. The Febi is 7.5, the same as the original 722.6 fluid. Shifting is really nice, much smoother in the low gears and on the part-load downshifts.

There are several suitable fluids for the 722.6, and in the Febi, I think I have found the best. It IS in fact, the fluid most closely resembling the ORIGINAL 236.10 spec in every way, including, most importantly, viscosity. It is made in Germany and mostly sold in Europe to service the millions of 722.6 transmissions sold there.

I honestly believe it actually is the original 236.10 fluid spec. I do not consider the 236.14 fluid to be as desirable in a 722.6 as the original spec fluid because the viscosity is too low. It will work, and Mercedes and her dealers will earn money by selling it, but it is not your best choice.

For what it is worth, I am using NGK BKR7E copper plugs, an ASP crank pulley, and add Marvel Mystery Oil to each tank of gas. I don't buy my filters or tires at the dealer, either. I use the Febi bearing grease, too, not the Mercedes grease. And when I replaced my subframe bushings, I actually bought a rubber lubricant from the BMW supplier because the Mercedes product was too expensive.

My goal is not to operate the most "pure" machines, but to maintain the best transportation equipment using the best tools and techniques available, at the lowest cost-per-mile achievable so as to maximize my return on investment.

This is not my first rodeo.

I even flushed my W202's steering box with CHF 11S, even though Mercedes still to this day recommends ATF for the recirculating ball systems. Call me crazy.

Last edited by bachusattackus; 02-19-2014 at 09:37 PM.
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post #4 of 13 (permalink) Old 02-20-2014, 08:28 AM
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when I changed at ATF 2 years ago, I looked around and failed to find any 236.10. I had no choice but to use 236.14. My indie only did pan flushes so I asked to do 2 pan flushes in 5K Km interval just to push in more 236.14.

In my experience for for my w209, 236.14 is great. My car is shifting so smoothly that I actually look forward for my next transmission service.
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post #5 of 13 (permalink) Old 02-20-2014, 09:57 AM
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Originally Posted by bachusattackus View Post
My car is at 14 years and 184,700 miles.

Both our W210 are past 250,000 miles
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post #6 of 13 (permalink) Old 02-24-2014, 08:49 PM Thread Starter
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Did you buy them new?
Have you never changed the ATF?
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post #7 of 13 (permalink) Old 02-24-2014, 09:56 PM
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Nope.
I bought wife car with 178k and did tranny service at 200k. I did see sings somebody work on it before.
Bought son's car last year with 255k on it. The ATF is pretty clear, so I believe it did have pretty recent service and I am not touching it at least for next year.

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post #8 of 13 (permalink) Old 02-25-2014, 08:57 AM Thread Starter
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What type of fluid is in your transmissions?
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post #9 of 13 (permalink) Old 02-25-2014, 09:13 AM
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I put the older MB fluid in wife car. Hope it is the same in son's

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post #10 of 13 (permalink) Old 03-18-2014, 10:07 PM Thread Starter
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I've noticed with the Febi fluid (Febi no. 22806) that my TempoMat (aka cruise control) is working better than ever. Besides smoother shifting, it seems to select gears more appropriately, both up shifting and downshifting.
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