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#1
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Is motorcycle gear oil suitable for a 300d diff?
I am looking at Lucas synthetic 75w140, but it's labelled as "motorcycle gear oil."
Just want to check. Want to use it in my '85.
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Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 |
#2
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No you should use a 75w90 gear oil. Or the special MB 75w85 from the dealer.
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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) |
#3
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Hey, why not. All you can wreck is the differential. Just kidding, I think it would work fine. I use Mobil 1 SAE 75 gear lube. I think it only takes a quart.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it! |
#4
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Not sure if it would hurt anything. But motorcycle gear oil is formulated not just to lubricate gears but also to play nicely with wet clutches. So it's probably, in my laymen understanding, similar in formulation to limited slip oil that is designed to work with the clutches in an LSD diff. You wouldn't use an LSD gear oil in your regular diff so I'd imagine you'd not want to use this motorcycle oil either.
A synthetic 75w90 as mentioned is ideal.
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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino http://i.imgur.com/LslW733.jpg The Baja Arizona Oil Burners Send a message if you'd like to join the fun Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130 Visit the W123 page on iFixit for over 70 helpful DIY guides! |
#5
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I use Amsoil 75/110 in my signature car and it works fine.
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'83 300D, 126K miles. |
#6
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Quote:
Thanks.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 |
#7
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MC gear oil should work but 75/140 is probably too high a viscosity
Most manufacturers are leaning towards less viscous lubricants these days for the sake of economy. Witness the fact that manual gearboxes now generally require ATF as a lubricant instead of the previous standard of gear oil. A differential has helical gears in it which means that EP rated gear oil is required due to the angular thrust of the gear teeth towards each other. I would say that a suitable weight of motorcycle gear oil in a diff would be fine but 75 - 140 is too thick in my opinion. All that happens if you use a thicker than necessary lubricant is that there is more heat generated by the shearing action of the gears passing through the fluid. It just overheats the lubricant and the heat breaks it down. Cheers Dan
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It's always something simple 91 300D 603.960 (from japan) 194K 92 Toyota Diesel Landcruiser HDJ81-t 116K 02 Golf TDI new head courtesy of PO 87 300D 97 BMW 525 TDS Wagon 5spd bunch of Onan and other diesel generators |
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