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West TN | I am getting ready to change the transmission oil in a Mack CH613 that I just bought. It has a Fuller
FRO-15210C transmission with approx 400k miles. Oil in the transmission now appears to be red in color and I am told by Mack Service Mgr that it is probalby 50 wt synthetic. He says I can refill with either 50 wt motor oil or 80W-90 GL5 gear oil. This seems like a wide spread in the visosicity of the two oils?
I would rather use the 80W-90 since that is what is used in the rear axles. Anyone else using 80W-90?
TIA
Edited by twswtn 9/2/2009 21:36
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SE South Dakota | I would put the 50 wt syntheic back in. The trans will shift better when it is cold with the lighter weight oil. I use the 50 weight, no problems. |
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| 80 90 is not recommended for the Trans
if there is tag saying that there is synthetic in it I would most definitely keep
synthetic in it |
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Seaford, Delaware | Farmboy99 is correct! Put the 50 weight synthetic in. The 80w-90 gear oil is too thick of a viscosity for that particular transmission especially in colder climates.
Alan |
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Seaford, Delaware | Also if you have the extended warranty out to 500,000 or 750,000 miles make sure the gear lube is Eaton/Roadranger approved or your warranty will be voided.
Alan |
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southwestern,ontario | Synthetic would be your best option...may cost more but will last longer and not break down like reg 80/90... |
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Brazilton KS | SAE 50 is only slightly heavier then 85W90. It is approximately the same viscosity as 95W140. Keep the synthetic in it. They put it in there for a reason.
Lubrication manual
Edited by plowboy 9/2/2009 22:27
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NW Washington | Here is some more info on transmission lube oils. http://www.heavydutytrucking.com/2003/04/076a0304.asp |
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West TN | Thanks everyone for all the info! I am going to use 50 wt. |
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What type of oil to use in Fuller 10 speed transmission?
