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Old 12-29-2009, 03:25 PM   #1
silverSurfer
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adding cold oil to hot engine

I was wondering if it's possible to damage the engine by adding cold oil to hot engine? You know, like your not supposed to put hot water on a cold windshield cause it can crack from expanding/contracting. I've been having to add a little oil every time I drive it hard and I keep my oil (Mobil 1) in the trunk and it's been really cold around here recently. I thought i heard a noise from the engine when I added some (1/8th qt) but it was probably the exhaust manifold.
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Old 12-29-2009, 04:22 PM   #2
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Nah, you're fine.
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Old 12-29-2009, 04:53 PM   #3
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your peachy dude - think about it - the second you start the car up your cold oils temp will sky rocket up to the temp it needs to be
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Old 12-29-2009, 07:14 PM   #4
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Quote:
Originally Posted by BlkLUDE5G View Post
your peachy dude - think about it - the second you start the car up your cold oils temp will sky rocket up to the temp it needs to be
I was thinking about the cold oil hitting the hot metal engine parts and causing them to expand/contract (whichever it would be). The exhaust manifold usually makes a 'tinging' sound as it's cooling off from the metal expand/contracting. When I added the oil it sounded like I heard that same sound coming from the oil filler cap area but I was prolly mistaken.
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Old 12-29-2009, 08:27 PM   #5
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where as from a scientific standpoint you are correct - the rate of the change is by far no where near any damaging effects - it would be much different (in an extreme example) if you had an overheated motor that just turned off and you accidentally dropped a chunk of dry ice down the oil cap
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