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xzostd1
Joined: 25 Mar 2006
Posts: 99
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| Posted: Sat Jan 06, 2007 8:01 pm Post subject: Y not Synthetic GL-5 in gearboxes? |
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Why can't GL-5 synthetic lube be used in a Meritor 10 speed?
The Meritor specs show that straight weight engine oils can be used.
What about a 20w50 Mobil 1??
Bill
Menominee MI. |
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Rawlco
Joined: 25 Jan 2006
Posts: 1114
Location: Central Maine
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| Posted: Sat Jan 06, 2007 8:59 pm Post subject: |
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| It depends on weather it is under warranty or not. If it is then you need to use a product that is approved by the manufacturer. If it is not then choose a similar product. For example Amsoil makes a synthetic transmission lube that will meet the Eaton specs, but needs a more frequent change interval than the Eaton branded oil. :? It meets all the independent tests but Eaton won't accept it under warranty. Each major lubricant manufacturer will have their own oil that will fit that transmission, so choose on price, availability, and the distributors ability to stand behind the product. |
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JoeyB
Joined: 03 Dec 2006
Posts: 85
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| Posted: Sat Jan 06, 2007 9:23 pm Post subject: |
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The back end (the hi/lo range selector) of the transmission is synchronized. Synthetic oil might be a little too slick for the synchro to work.
That's the same reason you don't use axle oil (the stuff with that smelly sulfur-phosphurs additive) in the box. They always called for straight mineral oil. The sulfer fouls the synchro- next thing you know it's grinding on range selection. |
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roadranger
Joined: 03 Sep 2005
Posts: 246
Location: Junction of MA CT RI (Putnam CT)
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| Posted: Wed Jan 10, 2007 5:59 pm Post subject: |
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| I use Mobil One 15W50 in engine/transmission/wet clutch motorcycle applications and it is fine. The lighter grades of Mobil One have "friction modifiers" in them that cause the clutches to slip :cry:. |
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JoeyB
Joined: 03 Dec 2006
Posts: 85
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| Posted: Thu Jan 11, 2007 6:25 pm Post subject: |
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| I think it would be an error to infer that if it's OK for the bike, It must be OK for the Merritor 10 speed also. |
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roadranger
Joined: 03 Sep 2005
Posts: 246
Location: Junction of MA CT RI (Putnam CT)
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| Posted: Thu Jan 11, 2007 8:41 pm Post subject: |
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| Actually, as far as I'm concerned the faster a Meritor lunches itself the better so you can get a proper Eaton put in :lol: . Seriously, using an approved synthetic is the way to go for longest life - but I suspect the Mobil One 15W-50 would do just as well (but why chance it?). Same for the differential. The engines seem to do fine with mineral oils changed at the proper intervals. I do run synthetic engine oils in all my other motors but plan to just go with the new 2007 diesel oils coming out now for the road tractor - maybe adding a bypass filter too and doing sample testing to possibly extend the drain intervals? |
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xzostd1
Joined: 25 Mar 2006
Posts: 99
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| Posted: Fri Jan 12, 2007 9:25 pm Post subject: |
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I just bought my (Meritor Approved) $116.00 pail of Mobil SHC 50 synthetic gear lube.
Following Meritor service intervals of 500,000 miles it will last until I have 2 million miles on my Volvo :shock:
Bill
Menominee, MI |
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Birken Vogt
Joined: 29 Nov 2006
Posts: 102
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| Posted: Fri Jan 12, 2007 9:46 pm Post subject: |
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Multi-vis oils such as 15W 40 are not recommended for transmissions either because the gears chew up the viscosity additives and it becomes a straight 15W real quick. I have been using Delo 400 straight 50 engine oil and I like the feel it gives over straight mineral gear oils.
Birken |
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Blind Driver
Joined: 12 Apr 2006
Posts: 491
Location: New Albany, IN
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| Posted: Fri Jan 19, 2007 3:17 pm Post subject: |
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| Sythentic oils are not recommended for any application that has some of the softer metals in it. |
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JoeyB
Joined: 03 Dec 2006
Posts: 85
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| Posted: Fri Jan 19, 2007 4:57 pm Post subject: |
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Blind Driver wrote: Sythentic oils are not recommended for any application that has some of the softer metals in it.
That's interesting. Do you know why? |
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Blind Driver
Joined: 12 Apr 2006
Posts: 491
Location: New Albany, IN
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| Posted: Fri Jan 19, 2007 6:50 pm Post subject: |
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| The softer metal will eventually disolve :shock: |
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Birken Vogt
Joined: 29 Nov 2006
Posts: 102
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| Posted: Fri Jan 19, 2007 10:45 pm Post subject: |
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I think you meant GL-5 oils, synthetic oils do not react with metals any more than any oil
Birken |
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xzostd1
Joined: 25 Mar 2006
Posts: 99
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| Posted: Sun Feb 04, 2007 8:20 am Post subject: |
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I did a un-scientific test
I put my containers of Valvoline 5w40 full synthetic....Rotella 15w40 .....and Mobil 50 synthetic gear oil outside in -14F temps.
The two synthetics are still shakeable
The non-syn. Rotella is not
Bill Tonight I'll test my Webasto engine heater after a -15 to 20F night |
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bob h
Joined: 15 Oct 2006
Posts: 664
Location: Nb
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| Posted: Sun Feb 04, 2007 9:47 am Post subject: |
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xzostd1 wrote: I did a un-scientific test
I put my containers of Valvoline 5w40 full synthetic....Rotella 15w40 .....and Mobil 50 synthetic gear oil outside in -14F temps.
The two synthetics are still shakeable
The non-syn. Rotella is not
Bill Tonight I'll test my Webasto engine heater after a -15 to 20F night
if you check your engine owner's manual, you might discover that your engine should be running a API C-rated 10w30 when ambient temps remain below 20 degrees... you oughta see 80w90 @ -30 ;0)
p.s. - what conclusions have you drawn from this test?...
were you surprised?
will the results effect your choice of engine oil? |
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Blind Driver
Joined: 12 Apr 2006
Posts: 491
Location: New Albany, IN
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| Posted: Sun Feb 11, 2007 9:07 pm Post subject: |
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Birken Vogt wrote: I think you meant GL-5 oils, synthetic oils do not react with metals any more than any oil
Birken
Wrong. Check out the manufacters websites.
Also, which is not widely known, in older engines do not use engine oils wih the starbrurst logo. They are missing an additive which was found to clog cat converters(in autos).
E.O.S. assembly lube is a good substitute. Available at your GM dealer. |
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