I was wondering if any of you folks who use the Mobil 1 synthetics know what gear lube I should use for my 98 K1500. My manual says to use 80W-90, GL-5 but Mobil 1 does not have a synthetic for that. Is the 75W-90 ok to use or do I use the conventional Mobilube HD Plus 80W-90 instead?
Dave
GM recommand 80w90s unless in a very cold cilamte for the front diff on
88 and new trucks because it 2wd mode the front spider gears are always spinning as only one axle decouples and the the other spins off in the spiders to prevent drive shaft from turning and the 80w90 provide a little thicker portective film for them. You could use it but personally I would not bother. Better off with regular lube changes for it every 20 or 30K if you want it to last a long time rather than less frequent changes with a more expensive oil and any gain in MPG from it in front axle would be minute. I would use it in rear axle though if you wanted too and do not forget to change Tcase fluid either.
synthetics know what
use 80W-90, GL-5
75W-90 ok to use orGM recommand 80w90s unless in a very cold cilamte for the front diff on
88 and new trucks because it 2wd mode the front spider gears are always spinning as only one axle decouples and the the other spins off in the spiders to prevent drive shaft from turning and the 80w90 provide a little thicker portective film for them. You could use it but personally I would not bother. Better off with regular lube changes for it every 20 or 30K if you want it to last a long time rather than less frequent changes with a more expensive oil and any gain in MPG from it in front axle would be minute. I would use it in rear axle though if you wanted too and do not forget to change Tcase fluid either.MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.