Oil pressure varying….concerned

[Sturoc]

Meanwhile back to the OPs problem...I have 250k on my gen3 1500 5.7 I used 5/20 once when i bought it @200k . Had Hemi tick on start up and when oil press gauge started doing a dance i switched up to 5/30 using Castrol Quaker Valvo am now running Mob 1 w/ a small bottle of STP synth treatment. Hemi tick goes away after a minute ( lifters filling up) Pressure is steady and increases slightly at higher speeds of course.
The miles and climate plus the way you drive the truck will all contribute to engine wear n tear . Hi mileage engine bearings etc have more wear and that affects flow/ pressure. The type of oil does to a certain extent. Try them all once and decide what works best for you.
If you still have a problem it could be 1. the sensor 2. the pump.
A engine oil good flush is always nice !

as far as RP ? it didnt hold up for me. But i go from Colorado -10 hi alttitude to southwest desert 120 deg heat a few times a year . So I change my oil with the seasons : early spring and late fall .

 

[JHoward]

FWIW, After I read here in the ramforum about the possibility of HEMI tick/cam/lifter failure I starting using Red Line 5w/30 with a PUROLATER BOSS oil filter in my HEMI @39,000 miles back in August last year with great results.

My HEMI didn't have the famous HEMI Tick. Just an occasional noisy drivetrain that is now super quiet and smooth on Red Line.

My oil psi increased ~ 5psi at 70 mph on the highway and hot idle on changing oil from Pennzoil Platinum 5w/20 to Red Line 5w/30. I would think that that is good

My 2017 HEMI now has 41,000k miles and still has a little warranty left until that expires later this year. I'm not the least bit worried, my HEMI runs and sounds better than it did brand new on Red Line oil and putting less than 2500 miles on it a year it'll be more prone to being wrecked by a crazed driver or a tree falling on it. I hope that neither happens.

I won't ever use 5w/20 in my HEMI engine again ... way to thin of oil. jm2¢.

JHoward

 

[LemmysDad]

Wild one, I hear this a lot. If mpg is a concern… “. I like to keep tabs on mpg because significant change means there is an issue that needs to be addressed.

I reset my trip odometer at every fuel fill up. If something changes besides my driving style or route (city vs highway) then I feel like this will be a good indicator.

 

[Wild one]

I reset my trip odometer at every fuel fill up. If something changes besides my driving style or route (city vs highway) then I feel like this will be a good indicator.

It's a good indicator as long as you factor in weather and winter fuel.Being from Ontario,i'm guessing you would be factoring in temps/weather and fuel differances though.

 

[LemmysDad]

It's a good indicator as long as you factor in weather and winter fuel.Being from Ontario,i'm guessing you would be factoring in temps/weather and fuel differances though.

Yup I do that. It’s not a perfect system but it helps. I lose 100km a tank with winter tires and winter fuel.

 

[George Anderson]

The note at the bottom might interest you.You'll also notice nowhere do they say 5W-20 is good for engine longevity,and you can be dammed sure if they thought 5W-20 was good for longevity,they'd be mentioning it.

Mention it? .....

 

[George Anderson]

They won't be using bulk conventional 5W-20 oil in the 6.4 SRT's or truck 6.4's,so he's feeding you a line about using conventional 5W-20 in everything. Why the hang up on not trying 5W-30 Redline,it's not hard to get,and it has a hell'va rep for use in the 5.7's,there's even a few guys running it in their 6.4 trucks,which calls for a 0W-40 full synthetic.If gas milege worries you,why are you driving a 5.7 truck,lol

0w40? Which part of the US?

 

[Wild one]

0w40? Which part of the US?

The worlds alot bigger then just the US,lol

 

[zogg]

Back to my original issue….coming home yesterday my oil pressure dropped down to 42 and even 41 psi at 75 mph. The oil is at the full mark as I checked it 3 times. Some guys post psi at 52-55 hiway.

I’m hoping it’s a bad oil pressure sensor or is my engine ready to grenade???? Ugh

 

[JHoward]

Back to my original issue….coming home yesterday my oil pressure dropped down to 42 and even 41 psi at 75 mph. The oil is at the full mark as I checked it 3 times. Some guys post psi at 52-55 hiway.

I’m hoping it’s a bad oil pressure sensor or is my engine ready to grenade???? Ugh

Why don't you try changing your oil/filter and see if that helps. It just might resolve your concern?

JHoward

 

[zogg]

That’s my intention on Wednesday. Hoping the filter got clogged or the oil broke down. Oh well

 

[ramffml]

I know my psi's went pretty high when I swapped out my RP 20-820 to a Fram XG. I don't remember exactly the psi I got before, but I'm now worried that my psi is TOO high, cold starts at well below freezing is like 60+ psi, driving when hot I'm at 51 psi, and idling is about 41 to 43.

I think there is probably that ideal balance between high pressure and oil flow but I don't know what that ideal value is. I do know I was seeing low 30's with my factory oil + filter and I never get that low anymore.

 

[zogg]

I’m going to change my oil with 5w20 valvoline synthetic and a mopar 399 filter. I used an RP filter last time as these are supposed to be the best. But, I’ve also heard that they sometimes do cause pressure issues. We’ll see what happens. If psi doesn’t change I’ll put in a new oil pressure sensor. If that all doesn’t help I guess I’ll take it to the dealer.

 

[ramffml]

I’m going to change my oil with 5w20 valvoline synthetic and a mopar 399 filter. I used an RP filter last time as these are supposed to be the best. But, I’ve also heard that they sometimes do cause pressure issues. We’ll see what happens. If psi doesn’t change I’ll put in a new oil pressure sensor. If that all doesn’t help I guess I’ll take it to the dealer.

If you change both at the same time then you don't know whether it was the oil or the filter that fixed the issue (if the psi's end up going back up).

I'd change the filter first, (lose about half a quart of oil but if you're at the top now you can handle that loss), run it and verify your PSI's. If no change after week, change your oil and keep your filter, if your psi scoot back up then it was the oil and you know you should stop running RP oil.

I think others would value that information, if it ends up being the oil.

 

[JHoward]

I know my psi's went pretty high when I swapped out my RP 20-820 to a Fram XG. I don't remember exactly the psi I got before, but I'm now worried that my psi is TOO high, cold starts at well below freezing is like 60+ psi, driving when hot I'm at 51 psi, and idling is about 41 to 43.

I think there is probably that ideal balance between high pressure and oil flow but I don't know what that ideal value is. I do know I was seeing low 30's with my factory oil + filter and I never get that low anymore.

My HEMI's cold/hot psi is about the same as yours and it may be due to the combination of the oil/filter?

When I was running my HEMI on Pennzoil Platinum 5w20 and the MOPAR 339 oil filter the cold and hot psi's were lower~5psi (44 hot idle/50 driving 70 mph.) So, I would think your good.

I'm currently using the PUROLATOR BOSS PBL 24651 oil filter but may use the Royal Purple 20-820 on the next oil change.

I purchased a couple Royal Purple oil filters and cut one open to see for my self the quality verses the PUROLATOR BOSS. I'm still not 100% on the plastic bypass thingy in the Royal Purple, overall quality is very good.

PUROLATOR BOSS 24651on the top/Royal Purple 20-820 on the bottom.

JHoward

 

[zogg]

I found a pic of the mopar 339 filter cut open. Looks similar to your Fram:

 

[zogg]

That’s what I’ll be using on the next change (mopar 339). Your pressure is a lot better than mine ever was. Today I see 26-27 at hot idle and down to 40 at 75-80 mph. The more I drive it the lower the pressure gets . Ugh

I thought about changing just the filter and then the oil later but I just want to get it done.

Looking at your cut away of the RP filter, I can see where one of those plastic tabs might have broken off and impacted the oil flow through the filter. I don’t know but I’m ready to go as soon as the weather get a bit warmer. Twenty degrees is too cold for me to lay on the concrete at 74 years old. Ha

 

[JHoward]

That’s what I’ll be using on the next change (mopar 339). Your pressure is a lot better than mine ever was. Today I see 26-27 at hot idle and down to 40 at 75-80 mph. The more I drive it the lower the pressure gets . Ugh

I thought about changing just the filter and then the oil later but I just want to get it done.

Looking at your cut away of the RP filter, I can see where one of those plastic tabs might have broken off and impacted the oil flow through the filter. I don’t know but I’m ready to go as soon as the weather get a bit warmer. Twenty degrees is too cold for me to lay on the concrete at 74 years old. Ha

Hopefully changing your oil and/or oil filter or both at the same time will resolve your oil psi concern.

However, it should be noted what ramffml posted in his comments. If you make many changes at once you won't know what resolved your concern?

IMA, that the Royal Purple oil filter is a thousand percent better than the MOPAR because of the spun micro glass filter media unless your concerned about the warranty.

Hopefully you'll keep us folks updated on your results.

JHoward

 

[zogg]

I’ll be sure to update this thread. Thanks.

 

[pacofortacos]

Back to my original issue….coming home yesterday my oil pressure dropped down to 42 and even 41 psi at 75 mph. The oil is at the full mark as I checked it 3 times. Some guys post psi at 52-55 hiway.

I’m hoping it’s a bad oil pressure sensor or is my engine ready to grenade???? Ugh

What was the oil temperature?
When you check the oil level, is it after a few hour sitting or just after shutting the engine off?
Is the engine quiet when the pressure drops?
Do you change the oil often or follow when the truck tells you to change it? Could there be sludge in the pan restricting the oil pickup?