Forum Discussion
VintageMopar
Jun 15, 2017Explorer
If you are draining and refilling the gear lube, synthetic is superior in all ways with no downside. Most likely 75w90. O.E. will use the cheapest lube that will do the job. Thats why we have petro based, synth blended and full synth. Full synth has best heat resistance to breakdown. Just what a RV needs. :)
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