Proper engine warm-up

[rbennett]

I think mfg's say start the car and drive immediately because they know most people garage their cars and the mfg's don't want the liability of carbon monoxide poisoning.

It was explained to me, for all internal combustion engines, the pistons are actually oval shapped at start up, they do not actually become circular until operating temps are reached.

This being the case, you have more wear concentrated along the wrist pin sides and more "blow by" contaiminating the oil.

As they say "Starting your car is a terrible thing to do"

[Brucelee]

Start your car, put on your seat belt, lock doors, turn on radio,

Drive away slowly and don't hammer the car till engine is at operating temp.

Turn off car.

That's all she wrote!

[underDAWG]

Originally Posted by rbennett

It was explained to me, for all internal combustion engines, the pistons are actually oval shapped at start up, they do not actually become circular until operating temps are reached.

Can someone educate me, please?

Boxster used 0W oil which is extreme thin oil. Cold weather really has very little effect on the circulation of the oil. Cold weather is hard on battery and ignition. But once the engine started. There is no issue. Prolonged idling only adds more pullution and more carbon deposit on the injection system including valves. My 2 cents.

[rbennett]

Originally Posted by underDAWG

Can someone educate me, please?

Prolonged idling only adds more pullution and more carbon deposit on the injection system including valves. My 2 cents.

I don't let it sit and idle in the morning, I do drive off after about 1 min. Its just I keep the RPM below 2500 until 185deg is reached, driving it with a slight load on the engine.

Hell, I'm just an IT guy, I my be talking out of my A@@ here.