Should I 'warm-up' my Car before a run? - Page 4 - Mercedes-Benz Forum

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post #31 of 34 (permalink) Old 03-24-2007, 07:20 AM
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The fastest way to warm up your car is to drive it right away...after i start my engine i wait about 30 seconds for the idle to drop to normal and then i drive away...but i try not to gun it for a few minutes...if i try to warm it up without driving it it will take forever to warm up benz mechanic tells me theres no evidence that not warming up will hurt your long as you change oil on a regular basis you should get 200k out of your engine
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post #32 of 34 (permalink) Old 03-24-2007, 07:28 AM
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A bit funny how some owners warm up their car at 50 degrees Celsius while others start and go below zero Celsius. So far I believe Marcus was the only one with technical evidence behind his views.

The fact that many engines "roar" when leaving almost immediately does not mean that this would be worse for the engine than leaving it idle too long. I'm not sure if it is all over EU but in my place idling is not allowed, max 2 minutes even at extreme cold.

Everybody is allowed to do how they feel best with their own car but I do like Marcus, except that I don't need to wait till the idle goes down, my diesel does not seem to have high idle when cold. Even if it had, I would let it run till oil lubrication works properly, then go. As long as the engine is cold, I run smoothly and avoid high rmp. At summer time it takes seconds to be ready to go, at very cold weather it may take half a minute.

Note anyway that the rest of the car needs to warm up too, you may get a false feeling if the engine has warmed up on idle while the rest of the drive train plus shocks etc. are not. Again better to get going relatively quickly but running carefully first, allowing all parts get ready.

Of course if there is a threat of windows getting misty, you have neglected preheating or other means (like using the garage) but have to wait till visibility allows safe driving.
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post #33 of 34 (permalink) Old 03-24-2007, 08:27 AM
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This thread reminds me of when my father and I both had Porsches. The dealer we used was in Cleveland Ohio (300 miles from here), and one time we took a car in that they had to keep for a while so someone had to drive us tp the airport.

That turned out to be the German-born service manager, and the theee of us hopped into a cold 911 on a winter day. The guy started it and took off immediately (no warmup time at all) saying something like "you have to force the car to warm up by driving it". I have to assume that he knew what he was talking about.

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post #34 of 34 (permalink) Old 03-24-2007, 10:01 AM
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Originally Posted by Musikmann
...saying something like "you have to force the car to warm up by driving it". I have to assume that he knew what he was talking about.
Yeah! I agree 101%. An engine was made to operate under a load, not sitting around idling.

From what I've read and experienced, there are more stresses on the internal components of an engine when it's idling, than when it's working under load, i.e. moving the car.

I do agree, however, that one should avoid using large throttle openings as well as high engine speeds when the motor is cold, but other than that, I'm of the opinion that a typical car engine, whether it's new or old, is not supposed to be warmed up through idling.

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