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Old 06-27-2003, 04:03 PM   #1
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Gear oil: 75W-140. what does that mean??

and is it important? I'm putting synthetic oil in the gearboxes tomorrow. Dodge manual recommends synthetic if there's going to be any significant towing...they recommend 75w-140. The dodge dealer wants 20 bucks per quart for Chyrsler synthetic gear lube; mobil 1 is 7 bucks....but I think the sae grade is 70w-90. is that a problem? what do those numbers mean?
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Old 06-27-2003, 04:12 PM   #2
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Re: Gear oil: 75W-140. what does that mean??

Quote:
Originally posted by chuck
and is it important? I'm putting synthetic oil in the gearboxes tomorrow. Dodge manual recommends synthetic if there's going to be any significant towing...they recommend 75w-140. The dodge dealer wants 20 bucks per quart for Chyrsler synthetic gear lube; mobil 1 is 7 bucks....but I think the sae grade is 70w-90. is that a problem? what do those numbers mean?
For lack of a better way to explain it the lower number is the viscosity of the oil at a certain low temperature (like 32 degrees) and the higher number is the viscosity number of the oil at a certain higher temperature (like 180 degrees).

If Dodge recommends 75W140 then use 75W140, NOT 70W90. I had problems with the rearend of a Ford Ranger running 75W140 instead of the recommended 70W90.
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Old 06-27-2003, 04:23 PM   #3
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I found the Texaco synthetic (85W140) a lot less expensive, about $100 for five gal. Use the Dodge sealant for the cover--it is made to withstand hot gear oil. Too bad they couldn't afford to put in a drain plug--messy job!
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Old 06-27-2003, 04:28 PM   #4
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Ok, I'm poking around the 'net now looking for info...do you think that 85-140 would be ok? I think that the mobil-1 is readily available in that grade. where did you get the texaco lube? haven't seen that around.
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Old 06-27-2003, 06:25 PM   #5
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Check farm supply stores. Should be me cheaper.
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Old 06-28-2003, 01:00 PM   #6
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Can't speak for Dodge but 85W140 is what I used. It will have slightly higher viscosity when cold but I didn't want to pay the $20/qt at the dealer for the 75W 140. I found the Texaco at the local bulk oil dealer. I think Shell has a similar product.
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