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#1
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Switching diff to M-1 synthetic question
I will be putting the rear end cover back on after the left side axle is in place. After the silicone has 'set' and it's ready for the fluid to be put in, should I run some clean regular oil few a few miles then replace with the M-1? I'm thinking that by doing it that way, the reg oil will act as a cleaner for the diff. Thoughts?
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Dale 1995 E320 Wagon 185K [SOLD] 1988 260e Sedan 165K 2007 F-150 XLT 188K [SOLD] 2003 Harley Davidson FLTRI Anniversary 26K ----------------------------- 2006 BMW 330Ci 110K - [SOLD]
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It's my impression that the syn basestock oils are the ones that contain the powerful detergents...certainly not the petro-based equivalents. However, since we're discussing gear lubes, I'm not 100% certain this is true. It certainly is for engine lube oils. |
#3
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The synthetic gear oil will clean much better than regular dino gear oil.
My suggestion is to fill up with the Mobile One gear oil and continue to observe the recommended 30,000 mile change interval. You could cut that short for the first change if you wanted, perhaps after a year of use if you don't put 30,000 miles a year on the car. If you clean the gunk from the bottom area of the differential that you can reach, that's plenty clean. Ken300D
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-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles |
#4
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what about using a pressurewasher to clean out the diff then spraying a light lube oil on the gears to displace any water, then putting it back together and filling with M1 Gear oil?
I would not drive with standard lube oil in a diff... that sounds destructive.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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BUT WAIT! That sounds like a great idea. Now if I can get a pressure washer from the local tool rental...
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Dale 1995 E320 Wagon 185K [SOLD] 1988 260e Sedan 165K 2007 F-150 XLT 188K [SOLD] 2003 Harley Davidson FLTRI Anniversary 26K ----------------------------- 2006 BMW 330Ci 110K - [SOLD]
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#6
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What I meant was that I would like the diff to be as clean as REASONABLY POSSIBLE so instead of putting the M-1 in and mixing with the residual dirty dino, it would be cleaner IF I were to put CLEAN dino oil in for just a short period THEN drain it and refill with M-1. Does this make sense? Thanks (for the serious replies!)
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Dale 1995 E320 Wagon 185K [SOLD] 1988 260e Sedan 165K 2007 F-150 XLT 188K [SOLD] 2003 Harley Davidson FLTRI Anniversary 26K ----------------------------- 2006 BMW 330Ci 110K - [SOLD]
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I switched to M1 last year. Did an abbreviated interval for the first fill...2,779 miles to be exact (I just checked the spreadsheet ).
I'm sure when I drain next time it will look like new fluid coming out. Just the way I like it! btw - your initial post made sense to me...I guess you are in trouble! Tim
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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
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1983 123.133 California - GreaseCar Veg System |
#9
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When I switched our two SD's over I drained the old brown syrup out , filled with M-1, ran them a couple months, drained again (pretty dirty yet again) and then filled with M-1 again, they've not been changed since, that was over 3 years ago....hmmm Maybe I'll do it again soon.
Our 300D I recently drained, but it had clean dino in it! I was amazed. That proves it had a good mechanical maintenance history (runs very well and smooth). I filled it with M-1 and sealed 'er up. Won't have to worry about that one for a long time.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#10
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Mobil-1
I recommend wiping the inside bottom of the diff with a clean rag and some solvent, to remove as much crud as possible, then filling with Mobil-1 and drving normally. As has been suggested, a change after one year would be reasonable. The subsequent fill of M1 should be good for at least 30,000 miles after that.
With all of the axle changes I had to do recently, I ended up draining and filling my diff three times in a year. The inside looked cleaner each time. Even the original dino oil came out fairly clean the first time, over a year ago. The Mobil-1 that replaced it came out clean each time except for a little suspended crud that I removed with a coffee filter (a slow overnight process ). Aside from being a better lubricant, the Mobil-1 has better cold-flow qualities, always nice to have in snow country. Although I no longer live in a cold climate (for which I daily thank God), I do occasionally visit one, and it's nice to do anything I can to make the old diesel run better. Jeremy
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#11
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Since you have the diff already open, why not find some decent cleaner (not sure if brake cleaner is ok to use) if you are that concerned. I can't imagine the inside to be that dirty. If its "dirty" there may be a different issue.
Last year, I just replaced the dino with M1 and its been fine. Whatever it is we all have been doing probably exceeds recommended maintenance requirements anyway.
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the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth... 2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa |
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Thanks for the replies! I will take the advice of most and go ahead and fill with M-1 and change in a year or so. May let it go longer as I do not put that many miles on annually. I do agree that by changing over to synthetic, it will be 'miles ahead' of the dino anyway.
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Dale 1995 E320 Wagon 185K [SOLD] 1988 260e Sedan 165K 2007 F-150 XLT 188K [SOLD] 2003 Harley Davidson FLTRI Anniversary 26K ----------------------------- 2006 BMW 330Ci 110K - [SOLD]
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