Some people let their cars warm up on a cold morning for a minute, others start the engine and drive off right away.

Is it true that while warming up the engine the oil is not flowing through your engine and causing unneccessary wear and tear?

Shouldn't we at least let the RPM's go down a little if the car has been sitting for over 8 hours before we drive off? What do ya'all think?

 

My layman understanding is that combustion is more efficient under load than otherwise. While revving free, the oil is allegedly getting more diluted with unburned fuel than if the engine were under the load of moving the car. But, you can't prove it by me.

 

If I correct remember , my manual 535d, discourages to warm up motor at start in cold weather too, but to drive off soon and slowly without forcing till all liquids will go in temperature (few minutes)

 

My manual for the 530i says that same thing. Do not let it warm off, drive right away.

 

Even if it's -30c

 

The engine oil is warm up, but not transmission is not. The need warm up both at the same time.

 

Even if it's -30c
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Its better to drive off right away slowly dont rev it too much keep it under 3500 RPMs or less if you wish and let the car warm up slowly. I would say use sound jugement if its -30 C. Let it warm up 30 secs or so before driving off then if its a concern to you but dont sit idle for like 5 mins to warm up.

 

How about idling like sitting in a parking lot with the heat on!

In Stop and go traffic tough luck buddy.

 

I usually let it run for 10 to 15 seconds before i take off!

 

So what does the jury come to ...on a cold day let it warm up for drive off?