Low oil pressure (15 psi) !!

[Paintor]

On 6/23/2019 at 2:24 AM, swathdiver said:

That bulletin is for Gen IV LS engines.  The oiling system and pump is different in the Gen V LT engines.

GM recycled the “LT” name, but Gen V is indeed LS.

 

Email Melling.

 

https://en.m.wikipedia.org/wiki/LS_based_GM_small-block_engine

[1SLOW1500]

This is reminding me of the thread about running more or less oil in the engine. To follow the manual,GM or do what you think is best.
As stated 5weight will not hurt anything however and again if it is found in there under a warranty claim, what do you think the chances of being under the warranty are?
That said donwhat you feel is best but just know the risks just to see the needle read more psi.
Best question does anyone running heavier oil believe that they are getting the same protection or better or worse.


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[Jacoby]

Better

[1SLOW1500]

Better

I will not argue the point. I believe same with difference is oil wear and oil temp. If there is more psi is that more wear on pump? Less mass of oil being moved? But curious why you think so?
I will say my unmarked additive I was given is thick as any oil I have see. But the 1 quart is gone. In a week or so of driving. Then I add more 0w20 to fill and that is it.
As I said I have see huge spikes on the oil gauge so that is also a concern. I will see what a good sensor and log has to say about it.

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[Lucchini]

Thanks guys,  I’m ok using the OEM 0w20 oil in the truck.  I am just trying to see if anybody sees their needle go to where mine does, idling, in gear, as in the pic in the first post after an hour of running in cooler weather or about 30/40 minutes of running in hot weather. It’s sits around 18/20psi just before the time frames I just mentioned.

    So far I have not seen anybody with the needle where mine is. I think one person on this thread has said they are getting about 15 Psi.

     I may have it documented at the dealer after all.

[1SLOW1500]

I have had as low as 11psi at idle after hard expressway runs. Oil is at its hottest.
I wonder how far off the gauage is with the whole human eye and all. I have a digital gauage in the truck, just haven't installed the sensors. Then I will see difference in the gauges.

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[Jacoby]

11psi on a built truck like yours is ridiculous.  If you think for a second that is ok then youre nuts. 

[1SLOW1500]

11psi on a built truck like yours is ridiculous.  If you think for a second that is ok then youre nuts. 

It's in spec with what the gm engineers say and also what is written in the gm bulletin. Also that is at 400rpm after a hard drive. Tap the throttle and it jumps to 40. Floor it hard and looks like it is way too high of pressure.
Remember they say something like 2 or 3 psi per 100rpm so 400 times 2 or 3 is 8-12psi.
Man in really need to find that bulletin again.
My truck gets hotter then stock and runs a race based oil and additives. These new oils are more synthetic additives then "oil" and the additives I add are built for the exact metals in the bearings and parts. They say they soak into the metal. And they must to something because in a week of hard driving the additive is gone and I top off with oil and have no problems after that.
My built lsx ran 15psi at idle.

I believe we have few things going on here.
1- hard to eye ball guess the pressure
2 - it is a two stage pump so at 400rpm yes it is low number but any throttle input it jumps to perfect pressure numbers
3- the sensor/gauge are more of a dummy light, they are slow and inaccurate at best.
I think a good arguement can be made for that is better thick oil at less flow or thin oil at heavy flow. Many say thiner oil protects better as it can get into the tighter clearances better, but there is a point that if your blowing that thought the wearing surface faster can the oil do its job. Also it doesnt stick onto the rod or fly around as much reducing rotional mass. There is a reason all race oils are super thin. Again a small jump in oil weight will probably not make a difference.

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[mikedeezxxx]

Thanks guys,  I’m ok using the OEM 0w20 oil in the truck.  I am just trying to see if anybody sees their needle go to where mine does, idling, in gear, as in the pic in the first post after an hour of running in cooler weather or about 30/40 minutes of running in hot weather. It’s sits around 18/20psi just before the time frames I just mentioned.
    So far I have not seen anybody with the needle where mine is. I think one person on this thread has said they are getting about 15 Psi.
     I may have it documented at the dealer after all.

You should probably get a better reading on your oil pressure by plugging into the obdII port with a digital reader some how. These gauges aren’t that accurate. They are just dummy gauges. I would only worry about it if it goes down to 0 psi. The coolant temp gauges are def just a ball park reading. I’d assume the oil pressure gauge is too.


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[1SLOW1500]

Oh and what about the oil filter bypass. That is said to be spaced to these engine and oil weights. 2 companies had issues with there bypass pressures. Me I like the oil to always be filtered. That is why I am installing that huge hp4 fram and may swap that to a fram gold but again bypass is the issue there.

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[1SLOW1500]

You should probably get a better reading on your oil pressure by plugging into the obdII port with a digital reader some how. These gauges aren’t that accurate. They are just dummy gauges. I would only worry about it if it goes down to 0 psi. The coolant temp gauges are def just a ball park reading. I’d assume the oil pressure gauge is too.


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100% right and same with trans temp. Goes to 300* nonidea why no one can read the little lines. Also reads in trans and not in pan or cooler. I had to hook up the scanner to read it.

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[mookdoc6]

If you guys are worried about it?  Put the new after market oil pump in it serious pressure no drop either for the corvette?  

[mookdoc6]

4 hours ago, 1SLOW1500 said:

I have had as low as 11psi at idle after hard expressway runs. Oil is at its hottest.
I wonder how far off the gauage is with the whole human eye and all. I have a digital gauage in the truck, just haven't installed the sensors. Then I will see difference in the gauges.

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Look at this Rig?  Jesus!

[Lucchini]

    1Slow1500, that’s one nice setup to stay on top of all readings. I think I am going to go to the dealer and have my truck documented at its lowest pressure and have the  mechanic plug in his OBDII reader to see the actual oil pressure in numbers.

     I will also test drive one of their 2018 trucks with same equipment and see what that does. 

 That should put it to rest as far as wondering if my truck is normal with its pressure. The funny thing is, of the new trucks that I’ve purchased in the past I’ve never had a concern like this but I have to admit it does concern me on this one.

 It seems the only way to know is to simply see what other trucks are doing in around the 2018 model year, as far as oil pressure goes. When I do get a chance to do this at the dealer, I will update you guys on my findings for other people with the same concerns.

[Chevor]

4 hours ago, mikedeezxxx said:

You should probably get a better reading on your oil pressure by plugging into the obdII port with a digital reader some how. These gauges aren’t that accurate. They are just dummy gauges. I would only worry about it if it goes down to 0 psi. The coolant temp gauges are def just a ball park reading. I’d assume the oil pressure gauge is too.


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I run an Edge Insight CTS on my diesels to read engine parameters.  Those stock gauges are misleading.

 

Nice thing about My edge is it will read 10 things at once.  I think the new ones will read 12.

Edited June 25, 2019 by Chevor