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Post by Upgrayedd on Apr 6, 2014 20:24:02 GMT -5
Just wondering. I've noticed some gy6 scooter manuals call for 10w40 or 15w40 engine oil in the rear end, while others call for 80w90 gear oil.
Ive not had the rear end apart on these, I know gear oil works a bit differently. And i figure on a technical side, it could treat gaskets differently; the gaskets on my rear end look to be the same gasket material as my engine up front.
Is anyone here running motor oil in the final drive here?
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Post by flqu06 on Apr 6, 2014 21:06:22 GMT -5
No way. Your scoot specs says 90 weight as well.
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Post by 90GTVert on Apr 6, 2014 21:12:27 GMT -5
Gear oil and engine oil viscosity ratings are not the same. 10W40 motor oil is actually similar to 75W90 gear oil. I stick with gear oil. I can't tell you exactly what the differences are, but I would assume it has properties specifically intended for use in a gear box. I sure hope they didn't make it smell like mouse pee just for giggles.
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Post by Upgrayedd on Apr 6, 2014 21:35:38 GMT -5
Gear oil and engine oil viscosity ratings are not the same. 10W40 motor oil is actually similar to 75W90 gear oil. I stick with gear oil. I can't tell you exactly what the differences are, but I would assume it has properties specifically intended for use in a gear box. I sure hope they didn't make it smell like mouse pee just for giggles. i know motor oil has more dispersants, and gear oil has a whole different add pack for the high pressures. and gear oil is more clingy, but you're right on about the weights being similar. . 20w motor oil is about the same viscosity of 80w gear oil. maybe they use the separate numbers to help keep people from getting confused between the two. this was just one of those things i noticed in a couple of manuals, i thought maybe they label the gear oil weights different in some other countries, curiosity got the best of me  probably not any huge amounts of pressure/shearing going on back there but still - the gear oil has a lot heavier antiwear add pack and that can't hurt. ive been running 75w90. |
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Post by flqu06 on Apr 7, 2014 0:17:55 GMT -5
Remember that these manual are barely legible and full of translation errors.
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Post by FrankenMech on Apr 7, 2014 0:20:07 GMT -5
I would stick with the gear oil also. In a real pinch I would probably use ATF before motor oil. ATF would have a closer additive package than motor oil.
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Post by dan50 on Apr 7, 2014 3:34:10 GMT -5
The owners manual for my DongFang says to use 10W40 in the rear end. A motorcycle mechanic told me to use 75W90 gear oil.
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Post by FrankenMech on Apr 7, 2014 9:23:39 GMT -5
My DungFang owners misinterpretation says use SAE 10W40 for everything except where it says to use the same as the engine oil which says 10W40 4T. That does not necessarily mean it is right... It will just get it through the 30mile/30day warranty period. -LOL
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Post by Deleted on Apr 7, 2014 18:41:29 GMT -5
I use 90w. It has better extreme pressure characteristics than 10w40 or anything else does. you can get higher viscosity gear oil than that. somewhere I seen 90w140. not sure what you would use that for.
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Post by usmcdoc on Apr 7, 2014 19:22:35 GMT -5
I use 90w. It has better extreme pressure characteristics than 10w40 or anything else does. you can get higher viscosity gear oil than that. somewhere I seen 90w140. not sure what you would use that for. 90w140 is used in some large Boat Power Trim Systems..also a friend that builds Monster Trucks uses that in their gearboxes. The stuff smells of rotten Onions and is literally as thick as Black-strap Molasses. It clings well though..cause they gotta heat the gear boxes to drain it all out when they check for metal shavings and signs of wear. I'd never try it in a Scooter cause the stuff probably turns into Grease at 32 degrees or less..  |
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Post by moofus02 on Apr 7, 2014 20:00:42 GMT -5
I tore up a seal in the gearbox on my snowblower this winter I've been using Lucas synthetic gear oil. Refilling before I cleaned the driveway and it flowed ok at 5°f. I'm going to use it in my scooter gearboxes
Sent from my SPH-L720 using proboards
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Post by moofus02 on Apr 7, 2014 20:04:50 GMT -5
Just looked at the jug high performance 80w90 guess it's not synthetic but it has climbing additives in it
Sent from my SPH-L720 using proboards
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Post by flqu06 on Apr 7, 2014 20:09:21 GMT -5
If i says synthetic on it it goes in my scoot.
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Post by Upgrayedd on Apr 7, 2014 20:12:00 GMT -5
I tore up a seal in the gearbox on my snowblower this winter I've been using Lucas synthetic gear oil. Refilling before I cleaned the driveway and it flowed ok at 5°f. I'm going to use it in my scooter gearboxes Sent from my SPH-L720 using proboards i know a few people who run the lucas gear oil with good results in trucks and big bikes. ive been settled in with valvoline fluids and rotella oil for years now, really i think if folks service regularly, parts, gears, engines etc live a longer happier life. i do like the synthetic fluids and use them as well. |
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Post by skuttadawg on Apr 7, 2014 22:03:22 GMT -5
Most require GL5 ( gear lube ) which is 80w90 . Now my Echarm calls for 15w40 just like in the engine . I also used Rotella as it is tougher since it is made for diesel engines . Change it every 1,000 miles or less . Depending on the clearances as to what viscosity would work best . Many new cars use 10w30 or 5w20 engine oil where the German cars use 20w50 .
I switched to Castrol Synblend since dino oil can leave a film and synthetic is slicker and can lower operating temps .
Try to get a sample out of the gearbox as GL has a stink to it compared to oil . You might be able to use straight 50 weigh engine oil if yours requires engine oil instead of gear lube . I know Chevy S10s and Cavaliers used 10w40 in the manual trans which was odd to me almost all others use GL5.
I built a racing Honda CR125 and I used Ford ATF in the tranny since it has a wet clutch . I also put in clutch springs for a 250cc so it would have more bite . I would told the Ford ATF work better and it seemed to do good as I did not have any tranny problems .
For GL5 I would get Mobil1 synthetic or Bel Rays Gear Saver oil .
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probably not any huge amounts of pressure/shearing going on back there but still - the gear oil has a lot heavier antiwear add pack and that can't hurt.
