4.0 check engine light came on
#1
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4.0 check engine light came on
4.0L with 214K miles. The check engine light came on. I noticed the oil pressure being between 10-25psi in highway driving, which is usually 40-50 psi. On slowing down and at stop lights, the pressure was coming down to around 5psi. Check gauges light never comes on. The engine is running smoothly. I had recently changed oil (Castrol Edge synthetic 10w-30) and oil filter (Fram rated at 10K miles).
When I checked the oil level a few times, it was fine. Noticed some smoke coming out of the dipstick pipe when I took out the dipstick to check the level. I do not recall seeing that before. Engine temperature is fine, enough antifreeze in the reservoir.
Couple other things - engine does leak oil (oil drain plug and rear main seal). In winter time ONLY, the oil pressure gauge goes to 0 and check gauges light comes on and that too not every day of winter - it happens randomly. Check gauges light goes away once the weather improves and the oil pressure gauge comes back to 40-50psi.
When I checked the oil level a few times, it was fine. Noticed some smoke coming out of the dipstick pipe when I took out the dipstick to check the level. I do not recall seeing that before. Engine temperature is fine, enough antifreeze in the reservoir.
Couple other things - engine does leak oil (oil drain plug and rear main seal). In winter time ONLY, the oil pressure gauge goes to 0 and check gauges light comes on and that too not every day of winter - it happens randomly. Check gauges light goes away once the weather improves and the oil pressure gauge comes back to 40-50psi.
#3
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Thanks. I will try that solution. I'm going to check the issue with an OBD reader first. I have been using this oil/oil filter combo for the past 5 years with no issues. I switch to 5W in winter.
#4
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#5
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Wix 51515 or Napa gold 1515 are the quality over sized filters. Cruiser will tell you the normal filters. As for oil. I've used Mobil 1 full synthetic and rotella 5-40 t6 and have been happy
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#8
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Oh boy. I won't use a Fram again now. I won't get the readings before Monday and I will post that on here. I will replace the oil and oil filter as well. Any recommendations on which synthetic oil or if Castrol Edge is fine?
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#10
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On another note, I have not changed the spark plugs in about 50K miles. The previous owner had never done the same. The Jeep starts up just fine, even in winter months if I leave it parked for a few weeks. Time for some TLC for the Jeep - I'll change those as well.
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Thank you for listening and understanding. Some guys never have issue with Fram until they over day they do. As for oil. People are biased here to be honest. Like I said what I personally use without issue. With oil, as long as you change it as you should, you're aright
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