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Most of us fully realize the importance of engine lubrication and it certainly has a rough environment. But many don't think about the transmission and differential as another place where quality lubrication plays role. It doesn't need to be replaced as frequently but it needs to be checked and replaced if nothing else for lower rolling resistance.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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