Hey all, just had a quick question, with my 300E I would always let it warm up everymorning, if I was in a hurry I would still make myself let it warm up for a minute rather than just taking off. I never let it cool down though, just shut it off when I got there.. So my question is, Is it necessary to let my 240D warm up? and also to let it idle for a bit before shut off? Just curious! thanks!

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2007 BMW 328XI

I would let it warm up a bit before driving but there is no need to cool it back down.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

ok cool, thanks!

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2007 BMW 328XI

I'll just add some clarification to 79Mercy's response. Your 240D has a naturally aspirated engine and cooling down is not necessary. Cooling down periods are critical on turbocharged engines. Letting the engine idle for a short period of time prevents coking of the oil in the turbo bearings.

When I bought my naturally aspirated E300D, I had to relearn my shutdown procedure after driving turbo diesels for over 10 years.

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Nothing cranks me like compression ignition.

- '95 Mercedes E300D "The Great White"
- '98.5 Dodge Cummins 24V 4x4 - "The Green Hammer" (Sold 12-08)
- '81 VW Rabbit diesel w/GTI suspension - "The JackRabbit"
- '00 Triumph Sprint ST for when I need speed

Good to know, thank you for the explanation.

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Nicolette
1977 240D

At least here on the "left" coast diesel is $4.50 or more a gallon. Warming up is a complete waste of fuel. If the starting idle is smooth and the oil pressure is normal, drive it gently for the first few miles. The only time one should warm up a car is to clear the glass of fog on a cold winter morning. By nature, diesel fuel contaminates the engine oil, so prolonged idling cold will add more raw diesel to the crankcase.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.

This is one of those hotly debated issues: whether to warm up or not. I don't: I subscribe to the theory that an engine's higher oil pressure under load has a better chance of distributing oil throughout the engine more rapidly than at idle.

What everybody does agree on is that if you don't warm up, you should drive gently for the first few minutes. If the uphill on-ramp to the highway is right outside your door, maybe I'd consider warming up first...

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marshall

1982 300TD (220,000 mi.)

I fire up, wait a moment for the oil pressure do go up and drive. Generally I have to wait in traffic for about 5 min right outside my home. By that time the car has reached 70*c or 82*c. I also refrain myself from going over 2000 rpm if the water temp hasn't reached 82*c.

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.