I just got my 2002 out of the shop from the injector(s) flooding the crankcase with diesel. I used to have 80 psi oil pressure at 2000 rpm now I have 60. Dealer thinks no big deal????? I think its new engine time, I have 75,000 miles with not much warranty left. I have also had 5 dual mass flywheels replaced, with GM refusing to replace the current one..... stay away from the 6 speed.

idle, I have 30 psi. Rev her up, 60-65 somewhere around there. You're good if nothing else is an issue.

idle i have 25 ish runnin never hardly ever over 60 and 55k on truck

My oil press. is about the same as above posts. 25-30 at idle 50-60 with rpm's. The dmax only needs about 15-18 psi.

71,000+ miles and like those above mine reads in the upper 20's at idle and just over 60 at interstate speed


Jim

I used to have 80 psi oil pressure at 2000 rpm now I have 60. Dealer thinks no big deal?????


I have an '04 LB7 with 4000 miles on it. I run Delo and the oil+filter have been changed twice. My oil pressure is 60 psi @75 mph in 108 degree weather. IMO your oil pressure is okay.

60 psi might be Ok with me if it was 60 before all this happened. It was 80 and now all of the sudden its 60, When the injectors failed it was under 30 and dropping and I am sure there is internal damage. With only 25,000 miles remaining on warranty, I need some GM help.

High oil pressure like that (80) is often the opposite of good. Spun bearings cause higher than normal pressures.


What you need to do is to check the oil pressure with a MECHANICAL Gauge. Electric OEM Gauges are notoriusly innaccurate.


BTW, with pressure numbers like you have, which seem normal, I don't think you'll get much sympathy from those of us here, or the folks at GM.


If you take the vehicle in for service, under warranty, listing the lowered oil pressure as a complaint, and a fialure occurs later, you have the documentation to make a claim.

Maybe they put in the wrong or differnet oil? Would not be the first time. Make sure it was 15-40.

mwhitfil ~ appears all your responses are from other than 02 owners which have a lower pressure baseline from the factory. But for those of us in which 80psi is 'Normal' to have it come back as Abnormal warrants concern ~ justly so. FWIW, my 02 has less than 10,000miles, reads 78 but drops slightly after warmup and I consider that normal. I recall many many concerned postings from then new 03 owners re their low pressures. Its was a GM thing ~ nobody understands

mwhitfil - I have a 02, about the same mileage as yours, had the same 80 lbs 2000 rmp pressure with 55 lbs idle prior to losing two injectors and having all 8 replaced. Oil pressure at 2000 rpm is now 60 and idle is now 40. GMC dealer told me to take a hike, took 6 days to even look at my truck, and did a poor job of repair and cleaning it up from the diesel tossed all over the undercarriage. I took a hike to Chev and the first of my two new trucks will be here Sept 1. My engine runs fine, but is noisier, now blows a little smoke on startoff. Undercarriage needs cleaned, which the Chev dealer is going to do.

Are they replacing your truck or did you order a new one? What you have experienced sounds excactly like my problem. I had the dealer save a sample of the contaminated oil and I made sure they used the same type (Delo) oil that I had previously been using. I am happy with my dealer service....but it seems they can't get any support from HQ. I have continuing flywheel problems also, with little support from GM.

mwhitfil - I have a 02, about the same mileage as yours, had the same 80 lbs 2000 rmp pressure with 55 lbs idle prior to losing two injectors and having all 8 replaced. Oil pressure at 2000 rpm is now 60 and idle is now 40. GMC dealer told me to take a hike, took 6 days to even look at my truck, and did a poor job of repair and cleaning it up from the diesel tossed all over the undercarriage. I took a hike to Chev and the first of my two new trucks will be here Sept 1. My engine runs fine, but is noisier, now blows a little smoke on startoff. Undercarriage needs cleaned, which the Chev dealer is going to do. I wonder why it would be a little more noisy after 3500 miles of over loaded diesel as the lube of choice mileshttp://www.dieselplace.com/forum/smileys/Big Smile.gif What do you do with all your trips across the border? You ain't bringing back no Mexicans are you?http://www.dieselplace.com/forum/smileys/Big Smile.gif

High oil pressure like that (80) is often the opposite of good. Spun bearings cause higher than normal pressures.


What you need to do is to check the oil pressure with a MECHANICAL Gauge. Electric OEM Gauges are notoriusly innaccurate.


BTW, with pressure numbers like you have, which seem normal, I don't think you'll get much sympathy from those of us here, or the folks at GM.


If you take the vehicle in for service, under warranty, listing the lowered oil pressure as a complaint, and a fialure occurs later, you have the documentation to make a claim.

I am not looking for sympathy....I am looking for precedence.

mwhitfil,


Why not change the oil again. Just to make sure everything gets flushed out. Some of the old oil does not come out when drained (look at the oil pan design!). So you may still have some diesel contaminated oil in the pan. Put in the Chevron Delo 400 you normally use. Then see what the oil pressure reads. You need to make sure you are comparing like conditions.


My '02 runs similar to what ShumDit mentions above. It starts at 80 psi and then drops down to around 70 after warmed up.

I did visually look at the oil after the first run to temperature. It looked clean. I have parked the truck over the weekend to return it to the dealer for the formal complaint on Monday. I plan on changing the oil next week....but I believe it pouring good money after bad or however that saying goes.

I would say thats normal. i have yet to the day seen injector fill the crankcase and damage result.now the diesel will clean the crap out of the motor. I agree with the above to check and see if the correct oil was added.note it with the dealer and gm. but I would not lose sleep over it.I see it time and time again when the injectors go south everyone worries about the motor....

When the dealer drained the oil it was as viscious as pure Diesel. The pressure was below 30 when I shut down the engine. I havent seen diesel listed as a recommended crankcase lubricant anywhere in the manual. The oil pressure is now 25% lower than it was before it went into the shop. I feel my concern is warranted.

Let us know what your oil pressure is after you change your oil again as mentioned above.

I went to change the oil the other day and guess what....I was almost 2 quarts low after only 1200 miles...I know it was full when it left the dealer because I checked it myself. I don't know what to think now, and my fuel mileage has also dropped to 13 in town and 15.5 on the hwy. thats nearly 4 mpg less than when it went in the shop...GM says hmm...well....hmmm.. let me talk to whoever.....I will get back to you.....yeah right....if the truck was not paid for they could have it back but now I got a $36,000 POS !

OC_DMAX wrote: My '02 runs similar to what ShumDit mentions above.* It starts at 80 psi and then drops down to around 70 after warmed up.

Same as mine when I change the oil. After a 1000 miles or
so...... it stays around 65.

Ok now we see more if the oil is down 2 qts poen one of the turbo hoses and inspect for oil. the diesel may have washed the turbo seal. Your milage going down I would have to see it to diag it.You may be right but doubt if GM will do a darn thing

I agree with Patrick, seen many with a crankcase full of diesel, with no internal damage. Also, I have never seen GM authorize an engine replacement because of diesel in the crankcase. I believe you will end up right where you started on this and just end up with a big headache and frustrated. Worrying about it won't change a thing.

Something to consider regarding fuel in the crankcase...


The following is a quote from notes and explanation codes that come with a UOA report from AVLube regading fuel dillution (part of the UOA).


"FUEL: Indicates unburned fuel in the lubricant. Causes oil thinning, increased wear and reduced load carrying ability of the lubricant. Reported as "A" Acceptable (0-3), "C" Caution (3-5), "E" Excessive(Over 5)."


http://www.dieselplace.com/forum/smileys/Geek.gif

I tried to contact all my technical reps about this ongoing problem and no one would speak to me. The one that is handling my case has evacuated due to a flooding threat in Fla. and another told me they could not talk to me because my case had been turned over to the "legal" department...not sure if that is good or bad. There is no way I could sell the truck due to the MASSIVE noise the flywheel makes and the extreme vibration at running speeds, not to mention the stick shake at idle and all the other symptoms GM says is normal.

I tried to contact all my technical reps about this ongoing problem and no one would speak to me. The one that is handling my case has evacuated due to a flooding threat in Fla. and another told me they could not talk to me because my case had been turned over to the "legal" department...not sure if that is good or bad. There is no way I could sell the truck due to the MASSIVE noise the flywheel makes and the extreme vibration at running speeds, not to mention the stick shake at idle and all the other symptoms GM says is normal.

Well, I guess there is one way to call their hand on this one. Act like your going to buy a new truck and trade this one in. When they loball you on the trade price get the sales dude to document why the low price. If the low price is because of the work needed to bring the truck up to par then go hit the service guy over the head with that. They can't have it both ways.

Jim

I would look into something your giving more info all the time.Injectors, fly wheel 5? how hard are you driving it.I had a 6 sped once that had a shaking stick. Went round and round with GM tech support.I took a guess and was right once. found the Accelerator position sensor bad and bent. It was under 36k miles so warranty paid for it.But with out the data info and visual inspection cant help much.