Anybody else who's running Napa Golds on their Jeep 4.0s notice lower oil psi with them? I did with mine.....and I found out by accident. I had to do a quick oil change on the Jeep and didn't have a Napa Gold on hand, so I used a Carquest Red filter I had on the shelf. The oil I used was the Rotella 5W40 I always use. Ever since the oil filter change, my oil psi has been consistently 5-8psi higher than with the Napa Gold. Kinda disturbing. I guess I will stay with the Carquest Reds because of the higher oil psi. Any ideas or opinions?
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Napa Gold filter on Jeep 4.0
- Thread starter pavelow
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Both the napa's and the carquests are wixes in my applications. So, the difference might only be the media itself (carquest blue/red or napa gold/nascar/cheapie).
You sure the difference isn't just due to having a new, clean oil filter? I sometimes notice a few psi lower oil pressure (just at idle) near the end of my OCI, then it pops right back up to normal after the next oil change. (This is with Wix and Napa Golds - I'm running a P1 now so we'll see in a few months if I get the slight pressure drop near the end of the OCI)
I thought Napa Gold, Wix, and Carquest Blue were all the same. Carquest Red is a lower-priced filter, presumably similar to either the Napa/Nascar or Napa Pro Select - so the media itself may be different (and probably less of it as well) vs the Napa Gold.
I thought Napa Gold, Wix, and Carquest Blue were all the same. Carquest Red is a lower-priced filter, presumably similar to either the Napa/Nascar or Napa Pro Select - so the media itself may be different (and probably less of it as well) vs the Napa Gold.
NAPA Gold = CQ Blue
NAPA Pro Select = CQ Red
there shouldn't have been anything in that filter to cause a low pressure reading,thats what the by pass is for.
NAPA Pro Select = CQ Red
there shouldn't have been anything in that filter to cause a low pressure reading,thats what the by pass is for.
pavelow
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Earlier today I pulled the Carquest Red off and put a Napa Gold on it. Sure enough, the oil psi is a little lower at idle and at various rpms. I'm going to leave it on as the oil psi falls within Jeep's specs. It's just odd though. Is the Gold filtering media more restrictive than the media used in the lower grade filter? Either way, I have been using Napa filters for over 10 years now and will continue to use them.
I do think this calls for a cutting open look see for what that is worth. Note, if the oil pressure sender is before the filter, a less restrictive filter will give lower readings.
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Quote:
Note, if the oil pressure sender is before the filter, a less restrictive filter will give lower readings.
Yes, it can. But under no rational circumstances can it mean reduced flow unless you're in pump relief. AKA - peaked out in pressure. If you're seeing higher pressure at anything under the limits of the pump ..the flow is the same.
Any differences should be barely measurable.
If the sender is below the filter, then no pressure difference can be seen regardless of the filter's static resistance unless the pump is in relief ..or internally leaks like a sieve.
Note, if the oil pressure sender is before the filter, a less restrictive filter will give lower readings.
Yes, it can. But under no rational circumstances can it mean reduced flow unless you're in pump relief. AKA - peaked out in pressure. If you're seeing higher pressure at anything under the limits of the pump ..the flow is the same.
Any differences should be barely measurable.
If the sender is below the filter, then no pressure difference can be seen regardless of the filter's static resistance unless the pump is in relief ..or internally leaks like a sieve.
My point was that the lower pressure with the NAPA Gold could mean a less restrictive filter and more flow to the engine. Or the cheaper filter could be giving more flow and more dirt. In comparing made by Wix to made by Wix, I would expect the more expensive filter to be better.
Good point about how a less restrictive filter could cause the oil pressure to actually go down ... but only IF the oil pressure sensor is before the filter. As Gary said, if the sensor is after the filter, you would never see any real difference in oil pressure unless the pump was at max pressure (ie, it's pressure regulator/relief valve was operating). The only time you'd probably be able to see that was when the oil is cold and engine RPM was high enough to get the pump into pressure relief mode. You would never see a pressure drop with hot oil at idle with different filters if the pressure sensor was after the filter ... but could if the sensor was before the filter.
Most manufactures of engines put the oil pressure sensor after the filer, but it's possible it could be before on odd ball designs.
Most manufactures of engines put the oil pressure sensor after the filer, but it's possible it could be before on odd ball designs.
pavelow
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Ah, a less restrictive filter decreases pressure...makes sense now. lol.
Originally Posted By: pavelow
I pulled the Carquest Red off and put a Napa Gold on it. Sure enough, the oil psi is a little lower at idle and at various rpms.Is the Gold filtering media more restrictive than the media used in the lower grade filter?
I can say for certain from personal experience that the media in the napa pro select(same as the CQ red)IS way thinner then the NG media almost to thin and tears easier FWIW to you.
I pulled the Carquest Red off and put a Napa Gold on it. Sure enough, the oil psi is a little lower at idle and at various rpms.Is the Gold filtering media more restrictive than the media used in the lower grade filter?
I can say for certain from personal experience that the media in the napa pro select(same as the CQ red)IS way thinner then the NG media almost to thin and tears easier FWIW to you.
pavelow
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I'm not going to lose any sleep over it...I've been running Napa Golds on this engine since it was brand new....112K miles and counting. lol. I just thought it was odd that the oil psi picked up with the "cheaper" Carquest Red and thought maybe the "filter junkies" here knew why. Thanks for the replies guys.
pavelow
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Update. I stopped using the Shell Rotella 5W40 and Napa Gold filter and started using Valvoline Max Life 10W40 syn blend and a Pure One filter and guess what......my hot idle oil psi never drops below 20psi-it hasn't done that in a long, long time. I have found my new oil and filter setup for this engine.
This is interesting.
Ive got a '97 Cherokee 4.0 and im using a Mopar filter and PP 10w30 oil.
At hot idle my guage says about 35-40.
Cold accel can exceed 65-70!
Vehicle milage is 123,000+.
Am considering switch to RTS 5w40.
Probably will stick with Mopar filter as they keep em at Wally's.
Will try to remember to post any chenges.........
Ive got a '97 Cherokee 4.0 and im using a Mopar filter and PP 10w30 oil.
At hot idle my guage says about 35-40.
Cold accel can exceed 65-70!
Vehicle milage is 123,000+.
Am considering switch to RTS 5w40.
Probably will stick with Mopar filter as they keep em at Wally's.
Will try to remember to post any chenges.........
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Your jeep's limit is 75lbs. Not all of them are that high, but that appears to be the stress limit that they want to put on the distributor/cam sensor(2000+) pump drive.
RTS isn't a poor choice for this engine. I wouldn't bother for shorter stuff. 6months would work under just about any mileage.
RTS isn't a poor choice for this engine. I wouldn't bother for shorter stuff. 6months would work under just about any mileage.
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