Quote:
Originally Posted by LitterBug
Not completely true. The output shaft is spinning inside the gearbox. No synchros are engaged so the gears are not spinning. Most manual transmissions should have enough passive lubrication circulation to be fine with this though.
Cheers!
LitterBug
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You are not only right, but engine on/off the gearbox gets the same lubrication. It's designed to lubricate itself, whether the input shaft is turning or not, the lubrication is the same.
With my Toyota truck I use engine braking to control speed and also keep up the braking vacuum. On steeper downhill slopes, you need to keep up the brake vacuum, so I engage the engine (ignition off) and it controls speed and maintains brake ability. Otherwise it can be very dangerous to coast downhill out of gear.
I was recently up in the foothills, and I coasted home for more than 6 miles with the
engine off the entire time by simply coasting and engine braking.