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Discussion Starter #1
Need know what other member think.

A few Burgie 650 owner here use Mobil 75W90 LS Synthetic gear oil for rear end, we change this every 6000 km same as engine + oil filter +tranny oil every 6000 km, someone tell us we change rear end Mobil 1 oil needlessly, once per year for this Mobil 1 Synthetic plenty. Ride 25,000 - 30,000 each year.

1 litre Mobil 1 Synthetic 75W90 LS cost only $10.00 - 12.00, so 3 x rear end oil change per bottle.

What other BUSA member think ?
 

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Re: Mobil 1 Synthetic 75W90 GL5 gear oil

Ichange the gear oil every second time i change my oil,filter and trans oil. The gear oil is as clean as new.
 

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Chérie, I think you could go out to three oil changes with not a problem. I do my transmission every other oil change and it comes out darker but clean. I change the final drive once a year with synthetic and it comes out clean too. Try two oil changes and look at the magnet to see how much metal is collected. But understand, aluminum will not collect on the magnet, only the steel and iron. Aluminum will color the oil silver.

I have Valvoline synthetic in my trucks rearend for now 8 years and 50,000 + miles. YMMV.
 

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There are no aluminum moving parts or bearings in the final drive, only ball bearings and straight cut gears.

Manual car gearboxes are lubricated for life ~200.000 miles, why shouldn't this transmission do fine with 30.000 mile service intervals?

[attachment=0:swmgwkpj]trans.jpg[/attachment:swmgwkpj]
 

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+1

I would say that if there was not alot of metal on the magnet that extend the change interval out for a few oil changes. There will always be some metal shavings on the magnet. But if you pull the drain plug and its magnet has a huge amount of "Hair" growing, there is a problem. Big trouble if the magnet looks like ME:




[attachment=0:156fzo4v]Beaker.jpg[/attachment:156fzo4v]
 

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Discussion Starter #6
Not have shavings, magnet get little wee bit charcoal gray liquid muddy like material, but so little, this wipe off in one little touch of towel.
 

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Chérie said:
Not have shavings, magnet get little wee bit charcoal gray liquid muddy like material, but so little, this wipe off in one little touch of towel.
That is finely ground up steel. It is the normal possess of a working piece of equipment. Its when you pull the plug and it looks like "Beaker's" hair in that photo you have to worry some. :lol:
 

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Discussion Starter #8
Yes correct, this residue very similar to when someone sharpen knife very long time on wet stone.


Beaker look like have really bad hair day ! :lol: :lol: :lol:
 

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I get the same issue of grey mud like Cherie does. I change my oil and transmission oil at the same time and I also change the differential fluid too. It's cheap and easy. :) I use Rotella Diesel Oil. 5w40.
 

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The advantage of Mobil 1 synthetic is that it will not break down and probably will outlast the bike. I intend to put it in my bike when i do the change then i will forget it unless the level drops for some reason.
 
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