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Originally Posted by SPOHN
I defiantly warm mine for at least 15 to 20 minutes being I have a oil cooler and oil pressure gauge. The gauge has let me see some high pressure up to 130psi when the oil is cold or even at 150 degrees when going down the road at 2.5K RPM's. But as soon as temps hit near 180 degrees it doesn't go past 90-95psi.
So that being said and having a oil cooler I feel it's best to let it warm for who knows how much an aftermarket oil cooler fittings can take over time at those pressures. If it was just the motor I wouldn't think much of it.
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If you are really letting it idle for 15 to 20 minutes before driving, you may be trading wear from overheated oil for wear related to unburnt fuel in the intakes and the host of other issues that accompany long periods of engine idle -- idling is not good for the engine.
There's a bunch of discussion of this on the interwebs, but this is a pretty good synopsis
Warm up the car by idling › Dr Karl's Great Moments In Science (ABC Science)
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Idling an engine is bad in so many ways. The fuel is not completely burnt, so it condenses in drops on the cylinder walls. This leads to both extra wear of the cylinder walls (because the fuel washes the lubricating oil off the walls), and unburnt fuel flowing down the walls and contaminating the oil in the sump. Idling also drops the temperature of the spark plugs, leading to dirty plugs, which can worsen your fuel consumption by some five per cent.
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