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  #1  
Old 12-12-2009, 10:15 AM
johnb
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Default No pressure

I have a question. I bought my truck about three weeks ago. Thursday after work it was about 16 degrees out. I started the truck there was no oil pressure. Shut it off started it again oil pressure was fine. Yesterday same thing happened. Any clues as to why this is happening?
Its a 2004 4x4 with the 5.7. thanks
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Old 12-12-2009, 10:17 AM
erm
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The oil has congealed in the cold and it takes a bit for it to warm up and flow. It may have been more at the sensor end than all across your engine.

For easier starting and quicker flowing of lube in cold weather I'd suggest installing a block heater.
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  #3  
Old 12-12-2009, 10:22 AM
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^---Agreed. Especially if you're running a heavier weight oil.
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Old 12-12-2009, 10:24 AM
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Or maybe a good synthetic oil if thats whats going on . I run Amsoil and it stays fluid like down to -60 below zero .
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Old 12-12-2009, 06:06 PM
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Yup. Run synthetic, best stuff around. Amsoil, Redline, Mobil 1 are all great synthetics. I've used Castrol as well but I only use Mobil 1 now.
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Old 12-12-2009, 08:41 PM
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Stopped at the dealer today,their reply was that there is a TSB for the pressure switch when the ambient temperature gets to a certain temperature. I guess it causes it to display a no pressure.I forgot to mention that I am running mobile 1 5w-20 in the truck. But the dealer says that it would cost around 220.00 to fix. Is this switch easy to get to? I would rather fix it myself. Thanks for the replies
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Old 12-12-2009, 09:15 PM
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Not sure . What motor you have ?
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Old 12-12-2009, 09:23 PM
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It has the 5.7 hemi
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