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To warm up or not to warm up???

4.6K views 20 replies 20 participants last post by  Dutch  
#1 ·
I grew up back in the day where most people's hot rods, or almost any older car for that matter, wouldn't even stay running in the cold when you first stareted it up after sitting overnight or at work during the day unless you kept your foot on the gas until the car warmed up. Now with the modern, newer cars I've never allowed my cars to warm up in the cold before taking off, and in fact have heard that it's bad for your car to let it run idle for more than like a minute or so. I live in the DC area so in the winter the nightime temps can range from the single digits to the 30s, but I still only let the car run for about 30 seconds, if that long, just to make sure the oil gets moving around in the engine a bit before taking off. I drive real gently until the temp gauge just begins to move, though.

So, the question is is it bad for my car to not warm it up before taking off in the winter? I can't see sitting there waiting as long as it would take for the temp gauge to begin moving, there's gotta be some inbetween. I've got a 2008 Charger R/T.
 
#5 ·
For most modern cars, it's recommended to warm up the car you let it sit for about 30 seconds then drive. Drive it lightly until the temp is in the normal range (in the middle of the temp guage). It is HIGHLY RECOMMENDED that you DO NOT do any WOT until your in the normal temp.
 
#7 ·
Your just waisting gas, only engine that I can think of that does harm to idle while warming up are deisels.
 
#12 ·
only engine that I can think of that does harm to idle while warming up are deisels.
Incorrect. THis is a HUGE myth. In fact, a modern diesel will NOT come to temp just idling. I start mine, let it go about 30 seconds, and go, just like a gas engine. In fact, Dodge will DENY warranty if you have too much idle time and an injector goes bad. (This is a HUGE topic over on my diesel truck forums).
 
#15 ·
I follow along with most of the others; Idle about 10 seconds, then keep RPM under 2500 while watching oil temp. Once oil temp pops over 1oo I let the dog run
 
#19 ·
about 10-15 seconds after I start the car I'll shift it into gear and then sit for a about another 30 seconds to 1 minute. Never really heard if it good or bad, but logic would dictate that it wouldn't hurt to let the tranny fluid warm up along with the the engine.

Anyone got a reason to not do that?
 
#20 ·
The most harmful thing <next to an oil out> you can do is let the motor run cold. 30 seconds or so is optimal then get in and get her warmed up. It warms up faster being driven then sitting at idle (5 min driving -15 min idle). Just keep it off high revs til she's up in temp. This is also what the manual states
 
#21 ·
I do not let mine warm up at all, I just turn the key and go. I keep the RPMs under ~2200 until the engine reaches normal temp.

Of course, I keep it parked in the garage and live in the desert, so my engine block is probably never colder than about 50 in the morning.