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i did this for about 2 straight years in my old 99 gs400 and i sold it a few months ago with 110k miles on it and absolutely no tranny issues. i have just about gotten completely out of the habit of doing this on my newer ls and i am glad. when i first got the 05 ls i always left it on the average mpg display and when i would down shift to assist in slowing down instead of braking i would notice a pretty quick drop in mpg (brake pads are cheaper in the long run than g's of gas sooo...). this quickly assisted in helping me to stop doing this.
in my gs it really helped out a lot, but i don't think i need it for the majority of the time in the ls... i got new rotors and pads on the ls the day i bought it and it stops very nicely.
do that regularly and no problems at all..... just use it as back up for last minute braking so don't trash my brake pads.. which seem to wear out quicker than one would expect despite proper driving..
never do it... when i got my LS i rode my brakes real hard and stopping was done and pads were torn to hell and i was broke so i down shifted for a little while and after got new brakes i stopped doing it completely
I never do it. Somehow I just don't like the idea of engine braking, particularly with an automatic. Besides, brake pads don't wear out THAT fast. LOL My LS has 62K miles on it and still on the original pads.
I do it from time to time. Especially when I want to drop some speed on the freeway w/o using brakes. I've had my car just under a year. No problems to report resulting from downshifting.
When reading through the manual, it stated to increase the life of your transmission, always drive in 'd'.
I was using the shift as well because it's a little more fun, but after reading this stopped. I also had my tranny go out in my previous car before this. I don't really believe this was the cause of the tranny failure, but for the six months before I manually downshifted the tranny when stopping for fun as well.