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Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
Sponsored by: Bakliner

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Old 09-15-2011, 10:41 AM
CF Beginner
Join Date: Sep 2011
Posts: 1
Default 6.0 oil pressure issues

Hey I just wanted to pass this on to you guys. 90% of oil pressure issues Ive found on these 6.0 engines is the O-ring between the oil pump & pickup tube..They deteriorate or sometimes are partially torn from factory ..This causes low oil pressure due to air getting pulled in with the oil..Also on cold startup it will take along time to pickup oil causing noisy lifters ect..If you notice your oil pressure gradually gets higher as the engine gets warmer you can bet the o-ring is the culprit..I always change the PUMP and the O-ring together though because its already apart so a fresh oil pump & a timing chain is just a good idea ..UNLESS your under 150k on the odometer...We are seeing 300,000 to 500,000 miles out of these with proper maint & good synthetic oil!!! My 6.0 just turned 290,000 miles yesterday..GO CHEVY!!!
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Last edited by Built_NotBought; 09-15-2011 at 10:47 AM.
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Old 03-01-2015, 05:36 PM
CF Beginner
Join Date: Mar 2015
Posts: 1

I realize I am about 1 year late but I would like to add clarity for those who follow. I had the same issue, no oil pressure when oil was cold but outstanding pressure once motor warmed up. This was my work vehicle(still is) so I had a lot of hard thinking to do. My vehicle has 223,000 on it. Buy or not to buy? (new, that is) My6.0L Vortec was running strong despite the oil issue. I took it to my local Goodyear who changed my oil and filter and installed a new oil sensor. Same problem. Considering the scope of work involved in replacing the pump I opt'ed to get a quote. I've done this work since before I could legally drive but today I run a heating and cooling business and don't have the time to do this. 1. Got quote. To replace oil pump $1000. I am beginning to think spend the money on a new van. 2. I thought, crap, I will have to do this job to justify keeping it. So, I thought I would do the water pump, timing chain and gears and oil pump. 3. Then, I caught my breath, thought it through and came to the realization that 1. My problem "HAD" to be the O-RING in between the pick up tube and the pump. Did I really need to replace everything else? In my case? No. My motor , no matter how well it is running, probably wont be real dependable after 300,000. Will the timing chain break in the next 75, 000? I googled it and couldn't find anything on them breaking. So, I did not have transfer cases or anything in my way, I dropped the pan and replaced the o-ring. I will not bore you with clean up and torque proceedures. The o-ring left residue inside the pump socket and on the tube it slides onto. I used the only solvent I had available which was acetone to clean it off. I coated some food grade lubricant on the o-ring before inserting the pick up tube. Took my time cleaning up the pan etc. You will need the o- ring, new pan gasket and the external cooler lines gasket. It worked. On single digit mornings I now have awesome oil pressure. The job wasn't bad at all. The new stee/neoprene gaskets are a synch. I am going to post some picks if it works. New and old gasket. The old gasket was once green. The green was what I washed off the oil pump and pick up tube w/acetone. My motor started having this problem around 220,000. It was sucking air around the o-ring when the oil was at its thickest. once it warmed and thinned, the pump would draw it up instead of pull air around the o-ring. I hope this has helped and I appreciate everyone else's help that steered me in the right direction.
Airstar (Craig)
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Old 03-01-2015, 05:36 PM

2000, 2003, 2500, 2500hd, 60, chev, chevy, hd, leak, lost, low, oil, pressure, sensor, silverado

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