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When i turn my car on in the garage i let it sit there for about 5-7 min to warm up before i drive it. I have noticed that on the floor on the lower part of the wall, directly behind my exhaust are a bunch of little black specks. When i rub it off it has a kinda dried oil residue look to it. What might the problem be? I'm taking my car to the shop tomorrow but i just thought i could narrow down the possibilities a little.
No need to warm it up for that long. Let it idle for 15-30 seconds, and go. There isn't any reason that your car can't warm up while you are driving. Just take it easy until it is fully warmed up. Letting your car sit and idle is a waste of time and gas ($).
I have a remote start in mine, so I just let it run for 5 or so minutes before I even go out to it. Ive never once driven it without it being at or near operating temp.
Besides that you "like" to idle the car for that long before driving, what benefit do you believe that this provides? I believe it provides no benefit. In fact, I believe that you are putting extra wear on your engine by running it for no reason.
If you drive your car daily, that means that it sits at idle for 5 minutes in the morning to warm up, and 5 minutes again when you go home. Thats 10 minutes a day. Over a three year period, that's over 180 hours of extra wear on your engine. Definitely not worth it.