Check Oil Level Problem - 93' ZJ -
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post #1 of 4 Old 08-23-2017, 05:53 PM Thread Starter
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Check Oil Level Problem - 93' ZJ

Hello, I need some advice on this issue. I have a 93' ZJ with a 4.0L I6 engine. Changed the oil to a Max Life synthetic blend (5-30w) day before leaving on a trip. Ran it for 200+ miles to the mountains, turned it off, then about an hour later turned it to drive and the "Check Oil Level" notification was on in the VIC. Checked the oil level, fine. Oil pressure, fine. Engine Temp, fine. I disconnected the negative to the battery to reset, Check Oil Level still on. Drove it around for 3 days and everything was fine. It was parked for 3 days, drove it today, Check Oil Level is still on, and oil level is fine.

From threads I've read here and on other Forums about this issue is that the 93' was the only year with the oil level sensor installed in the oil pan.

Other than replacing the oil level sensor, any suggestions? Remove and clean I reckon is a good one.

Could the change in oil viscosity going to a synthetic blend cause this problem?


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post #2 of 4 Old 08-23-2017, 07:51 PM
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The level sensor doesn't care about viscosity.

It's most likely just a solder joint issue with the VIC or the sensor actually died.

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post #3 of 4 Old 08-24-2017, 05:18 AM
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Agree with the above. Been using MaxLife in the ZJ for years and the oil pressure is just as it always was: 30 at idle and 50 max when driving.

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post #4 of 4 Old 08-24-2017, 07:30 AM
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Agree with the above X2. The sensor is a simple float switch with a resistance of 3300 ohms (based on this thread: If you are 100% sure it's full of oil you can check the resistance to test if the sensor is the issue. Cracked solder joints in the VIC are a common issue but the sensors do go bad. I had the coolant level sensor go bad on my 93. Reflowing solder joints is nearly free if you have the tools. The sensor is around $35 so it's a fairly cheap fix.

Edit: FWIW I'm fairly certain the VIC only checks the sensor when you start the engine. I've had sludgy old oil or very cold oil not drain back fast enough so that if I turned the engine off and restarted it it would give me the low oil warning. It has never come on while driving.
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