Oil pressure dropping when warmed up, gauge? - Mustang Evolution

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Old 06-27-2016, 03:02 PM   #1
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Oil pressure dropping when warmed up, gauge?

Hey question I have a 03 Roush Mistang GT. Since it has started to get warmer. Last 2 times out with car after about 20 minutes the oil gauge drops to zero when idling. When I hit the gas it returns to a normal reading. Has Roush gauges in it. After I shut car down and it cools down for a few minutes it is fine. Was a mile or so from home when it happened so just shut car down and let it sit. Thoughts ?


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---------- Post added at 08:02 PM ---------- Previous post was at 08:01 PM ----------

Haven't yet explored a manual gauge which is on the list.


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Old 06-28-2016, 08:31 PM   #2
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try to test the oil pressure. make sure its at safe levels. in the mean time, replace the oil pressure sensor. if its gone bad, it will usually do what you described. usually more unpredictable. otherwise, its more like an oil light than a guage. it doesnt give you real time pressure readings. just "Its good" or "Its bad". which is why it seems normal, and then drops to zero pressure. it has a certain pressure threshold, and if it drops to a certain psi, it reads as 0. never seen what too high pressure does though.
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Old 06-29-2016, 04:21 AM   #3
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How many miles are on the engine? It's common for oil pressure to drop at idle when the engine warms up, but dropping to zero is not good, if its a true reading.
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Old 06-29-2016, 05:50 AM   #4
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Only 35k I recently updated had the oil changed to a synthetic and one other note it was low on coolant.


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Old 06-29-2016, 05:30 PM   #5
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what weight of oil did you go with? Because the heat will thin out the oil quite a bit especially if your using 5w20?? I have been using 5w30 Pennzoil Platinum in mine because it runs better and it is not thinning out or shearing with temps. I recommend Full Synthetic and I would really consider 5w30 in Castrol GTX EDGE in the Gold Bottle or Pennzoil Platinum or Ultra. our 06 does really good one either and it uses no oil and has increased in fuel mileage some.
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Old 06-29-2016, 05:36 PM   #6
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Thanks Ronnie that's what I am wondering both days this happened it was in the 90s had been running they car around 20 minutes and at stop light pointed down hill and oil gauge dropped. It is using the 5w20 synthetic. Shut car down for a bit on level ground about 10 minutes and it was fine. Happened to think to check other fluids and saw I was low in coolant so thinking hot day, low coolant, pointing down hill all adding up. Topped off coolant and have had no issues over last couple days but will move to the 30 with next change


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Old 06-29-2016, 05:37 PM   #7
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Wondering if anyone is running 5w50 the car is supercharged and seeing different opinions. Car is new to me so learning as I go.


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Old 06-29-2016, 05:45 PM   #8
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I would just try the 5w30 first and see how it goes. I think you will see a big difference in that area. hope it helps.
I know some of the newer 5.0's are running the 5w50 syn. I think that that Motorcraft even specs it.
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