4.0 oil guage response time from cold eng. - Jeep Wrangler Forum
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Old 08-21-2012, 07:31 PM   #1
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4.0 oil guage response time from cold eng.

What is normal for the oil guage to respond from zero pressure to about 40 psi when the engine is cold? By cold I mean summer temperatures when you first start it up in the morning. Does your guage just jump from zero to mid range or is it a slow response time? Mine takes about 3 seconds from zero to 40 when cold. When hot only about a second. My guage runs at the 40 psi from then on cold or hot, high speed or idle and doesn't fluctuate very much.
I'm running valvoline 10-30w.

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Old 08-21-2012, 08:16 PM   #2
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That is a little slow but not too bad
Try using a wix oil filter.
also check the oil pressure switch connection because of the lack of fluctuation at idle and high rpm hot or cold . I would even replace my pressure switch

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Old 08-21-2012, 08:59 PM   #3
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I am do for a oil change so I will try a wix filter. Are there different level wix filters "part number" if yes which is the best one to use? Example: Fram has different quality level filters, or does wix only have one jeep 4.0 applicable filter?
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