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Old 04-29-2011, 08:15 PM   #1
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Oil pressure issue?

so a month or so back i had a bad oil leak (more like a roaring river than a leak) that originated from the oil sending unit housing) [that what my mechanic told me]. it was solved with a new sending unit (a non Chryster one). after it was replaced I thought all was good, said and done. I also had them do an oil change cause i had lost so much oil, and they put in 5W-30.

any who, a week or so ago, it was a nice warm day and i went out for a drive, after 30 minutes to an hour of driving, enjoying the weather, i noticed when i stopped the car at the light, the oil gauge would drop to 0, then bounce back up to its normal idle area.

So I called my mechanic, and explained the situation, and brought it back to them, and they tested, but could not replicate the issue, they replaced the sending unit again, just to be safe (a non Chrysler one), and ordered a Chryster one if the Non one didnt fix the issue.

Any way, it seemed that all was good for the last week, having no issue, until today, again, it was nice and warmer, so i was out running an errands, and after a while of driving, i pulled into costco to get gas and while sitting, waiting to get gas the oil pressure dropped to zero from its normal spot at idle, then back up. it only did it the one time, then was normal the rest of the trip.

My question, is this a oil sending unit problem? do i really need a Chystler part? or is this an oil issue, should i have them change the oil to 10W-30 instead of the 5w thats currently in it? (the 5w was put it when it was low to mid 40s outside air temp) its now warming and in the low 60s here.


sorry for the long post, and thanks for the help

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Old 04-29-2011, 08:26 PM   #2
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I replaced mine with a non Chrysler one because I would have to wait a few days to get one as no dealer close had one. Every once in a while the gauge will dip to 0 and the check gauges light will come on. Next stop, it will sit at 20LBS and never go under. Stupid thing. Dealer wanted $89 for it. I put in a $20 aftermarket. As long as I know it is good. I can live with it doing it once in a while. Oh, I too have 5W-30 M1 in it now. Will put 10W-30 in it in a few days.

Will

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Old 04-29-2011, 08:32 PM   #3
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don't know as i'd worry about it or not. mine used to idle at 10 and go up with the rpm's till it got around 40 or so. changed my oil to M1 a little over a week ago and now it sits at around 40. these guages are notorious for acting weird-know for myself, as long as it's showing something i'm not going to worry about it
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Old 04-30-2011, 01:03 AM   #4
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I run 10-30 in my 4.0, had the same problem, used a NAPA part and have had no issues since. I have used Valvaline in all my rigs for 20 years and have had good luck.
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Old 04-30-2011, 01:08 AM   #5
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Quote:
Originally Posted by robbiecc View Post
don't know as i'd worry about it or not. mine used to idle at 10 and go up with the rpm's till it got around 40 or so. changed my oil to M1 a little over a week ago and now it sits at around 40. these guages are notorious for acting weird-know for myself, as long as it's showing something i'm not going to worry about it
the oil pressure should go up with engine speed, the oil pump is an engine driven pump, the faster your engine is turning the more output you will get from the pump
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Old 04-30-2011, 01:47 AM   #6
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One thing you might try is a ZDDP (Zinc) oil additive. Alot of Jeep guys (especially ther older ones) including myself swears buy it. Will help with valvetrain noise, extend the life of the engine (combating all the detergants in the oil), as well as help with oil pressure.
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Old 04-30-2011, 10:35 AM   #7
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I just replaced mine and got it from NAPA. There were 2 available for my 2005 4.O. One for a gage the other for an idiot light. NAPA PART# ECH-OP-6888 ECHLIN (for gage)

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