6.2 hot idle oil pressure. - PerformanceTrucks.net Forums



GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

6.2 hot idle oil pressure.

Reply
 
Thread Tools Search this Thread
Old 07-14-2017, 11:20 AM   #1
TECH Fanatic
Thread Starter
iTrader: (4)
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 1,233
Thanked 8 Times in 8 Posts
Default 6.2 hot idle oil pressure.

Test drove a 2011 L9H truck yesterday and noticed hot oil pressure was 20 lbs or even less... seems pretty low. The truck has 68000 miles on it. I know the gen iv stuff is on the lower side of the equation but from what I remember that's a good 10 to 15 lbs less than my LY6 equipped 09 2500HD had at hot idle. In fact it's closer to what said LY6 did when we ran it once it ate a lobe off the cam.

The truck ran nice and quiet but it's a been beat up a bit which to me is okay because I want it to not give a damn about. That said I want it running well... The L9H doesnt have afm to bleed off oil pressure but still has stupid pressure relief in the pan.. however that should not affect idle.. Thoughts?
1994Vmax is offline   Reply With Quote
Old 07-14-2017, 12:04 PM   #2
TECH Junkie
iTrader: (2)
 
FFDP's Avatar
 
Join Date: May 2014
Location: Rogers, MN
Posts: 3,178
Thanked 88 Times in 85 Posts
Default

My 5.3 is just over the first line on the dash when hot hot, so that's like 25ish I'd assume. I run regular 5W30 synthetic in mine. I wouldn't think much if at all is different between the oil pumps on a 5.3 and 6.2, so that's shouldn't matter.

Just a random thought but if the oil isn't new and the filter isn't working right it could cause a small loss in pressure but that may not even be the case here.
FFDP is online now   Reply With Quote
Old 07-14-2017, 02:55 PM   #3
TECH Fanatic
Thread Starter
iTrader: (4)
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 1,233
Thanked 8 Times in 8 Posts
Default

Just seems pretty low... it was fresh oil but I don't know what they have in it... some bulk 5w30 I imagine. I ran multiple oils and filter brands on the 09 6 liter I had and the pressure never varied any amount on the guage anyway. Probably needs main and rod bearings in it... or cam bearings.... or all of the above lol. I have another 2011 6.2 with almost identical mileage to go look at monday... can always see where it's at too.
1994Vmax is offline   Reply With Quote
Old 07-15-2017, 08:53 AM   #4
12 Second Club
iTrader: (6)
 
MrHorsepowerLSx's Avatar
 
Join Date: Mar 2011
Location: NJ
Posts: 482
Thanks: 0
Thanked 5 Times in 5 Posts
Default

I have a 17 Denali with 3k miles and the oil pressure when hot is maybe 30psi, like FFDP stated his needle just being over the first bar, my needle is the same. Goes up soon as I drive. Also remember you spend more time driving then at idle
MrHorsepowerLSx is online now   Reply With Quote
Old 07-15-2017, 11:00 AM   #5
Hunt&Fisherator
iTrader: (15)
 
silver-mod-o's Avatar
 
Join Date: Nov 2005
Location: SETx
Posts: 14,157
Thanked 4 Times in 2 Posts
Default

2012 L94 here with 90K. Hot idle is 25-28psi and hwy cruise is right around 40. I don't like it since my other truck idles at 40 and cruises at 60 but every other stock, healthy GEN IV engine I've seen is right about the same...
silver-mod-o is offline   Reply With Quote
Old 07-15-2017, 11:50 AM   #6
TECH Fanatic
Thread Starter
iTrader: (4)
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 1,233
Thanked 8 Times in 8 Posts
Default

I need to check this one's hours but I think its done a lot of idling.... and I know I will... more than driving time in fact. My 05 as example has 190000 miles on it but 6000 hours run time lol. Weird a 17 is that low... my 15 6.2 truck was 40 according to the stock gauge.. but then I used 5w30 too and not 0w20 lol. So this one is low either way as it's not even making 20 at idle. Probably junk lol.. like the rest of the truck is. Drivers seat is trashed... covered in scratches... reeks like smoke after detailing. .. and the carpet is still full of mud. Dents here and there... but it's worth 24 grand... I offered 18 all in which is still too much and they actually got mad at me lol. The next truck I mentioned is also a 2011 but a sierra and basically at 68k as well... got a pic this morning that it had bushwhacker flares that rubbed through the paint all the way around which are not on the truck... and they still want 26 grand with it like that lol. Pretty sure I will just buy a new or year or 2 old f150 and forget this idea lol. Both of these gm junkers will need shocks and a front end right away from where I work... and they are at the mileage these gmt900's fell apart from our environment so that's a factor too. If I got them for in the high teens somewhere like they are worth I wouldn't care... but not for 25 to 30 grand like these ******** want. I can get a loaded 5.3 14 or 15 for the money they want for these trucks with less miles lol.

Last edited by 1994Vmax; 07-15-2017 at 12:17 PM.
1994Vmax is offline   Reply With Quote
Old 07-19-2017, 10:59 AM   #7
TECH Fanatic
 
Join Date: May 2014
Location: VA
Posts: 1,137
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by silver-mod-o View Post
2012 L94 here with 90K. Hot idle is 25-28psi and hwy cruise is right around 40. I don't like it since my other truck idles at 40 and cruises at 60 but every other stock, healthy GEN IV engine I've seen is right about the same...
My 150k mile 6.2 L92 does about the same. I am not worried. These 6.2's run lower oil pressure it seems.
tgui is offline   Reply With Quote
Old 07-21-2017, 12:32 AM   #8
Staging Lane
 
Join Date: May 2015
Location: Colorado
Posts: 72
Thanks: 0
Thanked 0 Times in 0 Posts
Default

My 6.2 has about 83K miles and is consistent with the rest of the responses. Just above the first mark at idle and about 40 when cruising.
FetzerValve is offline   Reply With Quote
Old 09-12-2017, 02:55 PM   #9
Teching In
 
Join Date: Dec 2016
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Default

2013 5.3L gauge reads the same as everyone's response, needle just enough over the first line for it be fully visible
BIGRED811 is offline   Reply With Quote
Old 09-13-2017, 10:09 PM   #10
TECH Fanatic
Thread Starter
iTrader: (4)
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 1,233
Thanked 8 Times in 8 Posts
Default

I didn't buy an old 6.2.... couldn't be bothered at the prices guys wanted for trucks that were junk. My new 17 has an L96 6 liter... it was dropping to like 25 psi hot initially but after I changed oil in it the engine seems to hold about 30 at idle.... dealer used it as a demo and did 2 oil changes and I wouldn't doubt they put in 0W20 instead of 5W30 lol. WOT is like 55 psi which makes sense with that stupid relief valve above the oil filter. See if this thing lasts.... my last LY6 ( same as the L96 but smaller injectors) ate a lifter at 60000 miles so we shall see lol.
1994Vmax is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 07:35 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: