Warming up the car before driving

[Porschekid]

Warming up too fast = hot fluids in a cold engine with cold seals which is not good. It's the same principle as keeping the rpm's low when starting out. The cooling system in a car is sufficient to warm it up when you start out. Only disadvantage to warming up is that a cold engine burns more fuel (wasteful and worse for the environment.) Even when warming up you want to take it easy when starting out because your tranmission fluids also need to warm up while driving. I'm not saying to let the car sit for 10+ minutes but 2 minutes or so (especially when cold out) is good for your car. Older cars benefit more but the principle remains the same.

[donv]

Where does that "hot fluid in a cold engine" come from? You don't mean the oil or "coolant" do you?

The worst time for the engine is the microseconds while you're cranking it but it hasn't started yet - because oil pressure is low and the rings are scraping what little oil is left on the cylinder walls off. Everything after that is a breeze in comparison, so long as the oil pump is working OK. I pause just long enough for the top to lower or the attractive chimes to stop and then I'm off...

[Brucelee]

In the extreme cold, I see widom in allowing the engine oil to circulate a bit. By that I mean, a minute or two seems prudent. Driving easily until full engine temps is also prudent.

Lastly, in very cold weather, a clean quality synthetic is a must. Personally, if I lived again in NE, I would use 0W-30 syn in winer. Then again, if I lived there again, I would start drinking heavily again!

[hobo]

I have noticed my tires are a little out of round in the morning and it takes about 5 mins of driving for them to smooth out. Anybody else notice this. I have Pireli tires.
- Hobo

[donv]

Have the same issue, *much* worse in the first drive after the car comes out of winter storage... but it goes away as well.