Quote:
Originally Posted by MartinK
Seems to be a much-discussed issue.
There's no suggestion that auto transmission wear is increased if the car is left in D (some people say that moving the selector constantly between N and D in stop-start traffic actually increases wear). However I would assume that because the viscous coupling is engaged and working when D and stationary, that it will increase temperatures, and hence "wear" the oil.
So if I'm stationary for more than a few seconds, I select N and put the handbrake on. If it's likely to be more than a minute, I'll also stop the engine.
I don't like (and it's not considerate, and contradicts the Highway Code) to sit with my foot on the footbrake giving the people behind a face-full of red brakelights for more than a couple of seconds once stationary.
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Regarding holding on brakes, I always put the handbrake on too rather than holding on the footbrake for the same reasons. It probably beneficial anyways with these given the known H/B shoe issues.
Regarding 'D' vs 'N', I don't know but tend to hold in 'D' at idle unless it's likely to be for a longer time (minutes) then I switch off and go to 'P'.