trans improvement and mileage

[jack black]

Originally Posted by JimKellyfan

I can almost guarantee I get better mileage, and will report back my averages.

Looking forward to the report. From my experience, oil changes has zero impact on fuel efficiency, unless one uses wrong viscosity before or after.

[evo165]

Originally Posted by jack black

Looking forward to the report. From my experience, oil changes has zero impact on fuel efficiency, unless one uses wrong viscosity before or after.

I am sorry that i don't quite agree with your above statement. Transmission oil is there to lubricate our manual gearbox and auto gear box use them to lubricate and provide high pressure to make the solenoid works to make auto gear shifts.

As oil age due to heat and constantly moving... the oil will lose it properties and get thicken up over time... Maybe 80k and above... Once the oil properties is weaken and viscosity get slightly thicker, your car mile per gallon will be affect.

The principle is the same like a engine oil. People to tend to feel "lighter" and get better mileage after engine oil change. Just that our gearbox oil last longer than our engine oil.

P.S. If we constantly change the gear oil within the service period, we may not be able to feel the different. But if owner doesn't follow the service period, say 100k over mile. Changing the gear oil will make you feel the different. The effect is more drastic for Auto gearbox than Stick gearbox.