Question : I HAVE
two cars, one an auto transmission and the other a manual.
With the manual, I tend to downshift whenever I want to slow
down, from say 80km/h in 4th gear and drop down to 3rd.
This has affected my driving style while I'm with my auto
Whenever I want to slow down from the same speed, my right
hand tends to push the overdrive off button to force the
transmission to downshift.
Will the downshifting ( engine breaking ) affect the wear and
tear of the transmission of both my auto and manual ?
The brakes of the car are designed to slow down the car and
unless under difficult conditions such as descending steep
hills, one has no need to use engine braking.
Commercial vehicles use a lot of engine braking simply
because the engines are so large and can actually help a lot
when slowing down.
However, with passenger cars the brakes are more than
adequate and if one keeps shifting down to slow down you will
find higher clutch wear and even higher piston and ring wear.
In an auto transmission, you will get higher clutch wear and
in some models even premature bearing failure due to excessive
thrust loads when shifting down.