Date registered: Feb 2011
Vehicle: 2000 C230 Kompressor Special Edition
Location: Knoxville, TN
Mentioned: 0 Post(s)
Quoted: 15 Post(s)
" 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 MB has never withdrawn that recommendation.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 08:37 PM.