Duramax Diesels Forum Truck of the Week
  #16  
Old 09-09-2019, 01:47 PM
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I think I would try seme 50 weight oil before adding any "stabilizer", or other additive
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  #17  
Old 09-09-2019, 06:19 PM
Johnboylb7 Johnboylb7 is offline
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Well i havnt went to rotella full synthetic but i will say i used delo 15w 40 paid did the oil change for 60 bucks and a week later tried another oil change for 50 bucks and switched to delvac 15w 40. I know its not expensive to do an oil change but when you do 3 in a month gets a little annoying and gets spendy when you find out its not the problem so honestly imma need more input on whether people think doing a switch to rotella full synthetic would actually fix the problem. Does anyone have any tips on how to troubleshoot if its the oil pump? Or do i just pull stuff apart and find out whats dirty and replace all of it?
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  #18  
Old 09-09-2019, 06:23 PM
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It needs bearings if it’s not making oil.
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  #19  
Old 09-10-2019, 08:36 AM
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I have never seen a different brand of the same weight oil help with a low oil pressure problem. I have seen where a higher viscosity (such as a 20w50 vs a 15w40) will raise oil pressure on an engine that needs some help. It isn't a real fix, but it may be a bandaid to get you by until you can afford to pull the engine and install some new bearings.
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  #20  
Old 09-10-2019, 10:32 AM
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2x ^^ I second this
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  #21  
Old 09-10-2019, 10:54 AM
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Quote:
Originally Posted by JoshH View Post
I have never seen a different brand of the same weight oil help with a low oil pressure problem. I have seen where a higher viscosity (such as a 20w50 vs a 15w40) will raise oil pressure on an engine that needs some help. It isn't a real fix, but it may be a bandaid to get you by until you can afford to pull the engine and install some new bearings.
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Originally Posted by 2004LB7 View Post
2x ^^ I second this
You guys just kill my hopes hahaha. I'm just hoping I can re-use my pistons at ~270k miles vs buying new. It doesn't have tons of blowby. I sent an oil sample in just to ensure its not fuel. The oil level isn't climbing.
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  #22  
Old 09-10-2019, 11:10 AM
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Quote:
Originally Posted by Bdsankey View Post
You guys just kill my hopes hahaha. I'm just hoping I can re-use my pistons at ~270k miles vs buying new. It doesn't have tons of blowby. I sent an oil sample in just to ensure its not fuel. The oil level isn't climbing.
If it makes you feel any better, I was seeing around 30 psi oil pressure at 2k+ RPM when I was loaded (around 38-40 psi empty at around 1800) on my truck. I switched to 20w50, and I now see around 44 psi loaded at 2k and 46-48 empty at 1800. I'm going to keep running 20w50 until I start seeing pressures drop with that, and I'll address it at that time.
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  #23  
Old 09-10-2019, 11:19 AM
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Quote:
Originally Posted by JoshH View Post
If it makes you feel any better, I was seeing around 30 psi oil pressure at 2k+ RPM when I was loaded (around 38-40 psi empty at around 1800) on my truck. I switched to 20w50, and I now see around 44 psi loaded at 2k and 46-48 empty at 1800. I'm going to keep running 20w50 until I start seeing pressures drop with that, and I'll address it at that time.
how hot was the oil?
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  #24  
Old 09-10-2019, 11:37 AM
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Quote:
Originally Posted by JoshH View Post
If it makes you feel any better, I was seeing around 30 psi oil pressure at 2k+ RPM when I was loaded (around 38-40 psi empty at around 1800) on my truck. I switched to 20w50, and I now see around 44 psi loaded at 2k and 46-48 empty at 1800. I'm going to keep running 20w50 until I start seeing pressures drop with that, and I'll address it at that time.
My concern is that the truck won't like to cold start below zero with 20w50. Usually I run 15w40 or if its going to be a cold month/few months I run 5W40.
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-Tuned by Starlite
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  #25  
Old 09-10-2019, 12:04 PM
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Quote:
Originally Posted by Chevy1925 View Post
how hot was the oil?
235-240 when I was loaded and seeing 30 psi. 210-220 unloaded with higher pressure. Temps ran the same after switching to 20w50 with much better pressure.
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  #26  
Old 09-10-2019, 12:41 PM
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Quote:
Originally Posted by JoshH View Post
235-240 when I was loaded and seeing 30 psi. 210-220 unloaded with higher pressure. Temps ran the same after switching to 20w50 with much better pressure.
i dont think you are really far off from what most see at those temps.

how does it compare now with the 2020 cooler?
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02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

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  #27  
Old 09-10-2019, 07:50 PM
Johnboylb7 Johnboylb7 is offline
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Thanks for the input you guys have been some damn good help and i really appreciate it. Imma save up some cash and just do a rebuild on the bottom end and a partial on the top end as well as reset my valve lash. I will post when the job is done and let you all know what was found. Thanks again very much.
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  #28  
Old 09-10-2019, 08:25 PM
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If I may suggest some cheap upgrades you’ll appreciate for reliability in the future, delip your lb7 pistons and run lbz rods if you’re already pulling everything.
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  #29  
Old 09-10-2019, 09:39 PM
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Quote:
Originally Posted by Chevy1925 View Post
i dont think you are really far off from what most see at those temps.

how does it compare now with the 2020 cooler?
I have not noticed any improvement in oil pressure despite lower oil temps showing on my gauge which is what makes me question the validity of my gauge readings compared to the readings I saw in the old sensor location. If anything, presides actually seem to be down just a tad which makes me wonder if I’m seeing a large pressure drop across the oil filter. They have changed up the filter bypass in the new filter head which is good, but perhaps the new filter is slightly more restrictive. I may see about picking up the correct filter for the new filter head.
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  #30  
Old 09-11-2019, 12:47 PM
Johnboylb7 Johnboylb7 is offline
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Quote:
Originally Posted by zakkb787 View Post
If I may suggest some cheap upgrades youíll appreciate for reliability in the future, delip your lb7 pistons and run lbz rods if youíre already pulling everything.
Good idea man thanks for the tip. Any other tips you have up your sleeve. While im replacing bearings and have the whole bottom end apart? Ive already built the top end a little has a fresh head gasket and arp studs fresh gaskets from heads upeven the turbo.
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