Duramax Diesels Forum Truck of the Week
  #16  
Old 06-28-2010, 10:26 AM
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Originally Posted by 05smoker View Post
I don't remember what diff it made when I was running Cenpeco 20w-50 vs 15w-40 in my LLY (any little bit helps in an LLY) but it did add a few psi when warm. I might actually go back to it this next change and can chime in again then. I ran Mobile 1 once and never again. I believe in it in my gassers but it was too thin. Only time my Dmax ever used a noticeable amount of oil between changes.

Anyone ever conclude why the LLY is so much lower than the LB7?? My LB7 with 157k on it would damn near peg it at start up and then hover at 40psi most of the time.
I'm my humble opinion the LB7's have a better bottom end an I think that's why they hold better oil psi. IMO
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  #17  
Old 06-28-2010, 10:46 AM
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ok heres the oil while engine was hot. it peaked at 48 because i was accelerating but going about 60 it was about 45.6
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  #18  
Old 06-28-2010, 12:03 PM
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Quote:
Originally Posted by 05smoker View Post
Anyone ever conclude why the LLY is so much lower than the LB7?? My LB7 with 157k on it would damn near peg it at start up and then hover at 40psi most of the time.
It's cause LLY's are like the Fonz, calm and collected. Like a person having low blood pressure under stress. Every things cool man.

Quote:
Originally Posted by duratothemax View Post
definitely noticed an improvement in acelleration and turbo spool too.
I'm skeptical of this claim. Is this like seat of pants meter stuff. I fail to see how changing oil grades helps the turbo spool better. Enlighten me, please. No KB style breakdowns either.

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Originally Posted by wdino73 View Post
I'm my humble opinion the LB7's have a better bottom end an I think that's why they hold better oil psi. IMO
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  #19  
Old 06-28-2010, 12:17 PM
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Originally Posted by Diesel Pilot View Post
It's cause LLY's are like the Fonz, calm and collected. Like a person having low blood pressure under stress. Every things cool man.
If only EFI Live could be programmed to start the truck when you bang your fist on the hood.
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  #20  
Old 06-28-2010, 12:31 PM
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Originally Posted by 05smoker View Post
If only EFI Live could be programmed to start the truck when you bang your fist on the hood.
Couple wires and a shock sensor from an old alarm kit would do it.
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  #21  
Old 06-28-2010, 01:25 PM
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Quote:
Originally Posted by duratothemax View Post
the factory oil pressure gauge is accurate (it doesnt "lie" like some people might say the coolant temp gauge does) but its best to get an actual digital "number" reading with the tech 2 or efilive


You can not trust this reading. The Tech2 gets it's info from the same sensor as the factory gauge. If you want a true ready you will go old school and run a mech gauge from one of the oil ports on the block and have a aftermarket mech oil pressure gauge to read
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  #22  
Old 06-28-2010, 01:58 PM
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Originally Posted by Diesel Pilot View Post
I'm skeptical of this claim. Is this like seat of pants meter stuff. I fail to see how changing oil grades helps the turbo spool better. Enlighten me, please. No KB style breakdowns either.
that was a complete joke. Of course changing oil isnt going to make it faster or help turbo spoolup. : Im surprised it took several posts for someone to catch on and comment on it.
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  #23  
Old 06-28-2010, 02:00 PM
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Originally Posted by wdino73 View Post
I'm my humble opinion the LB7's have a better bottom end an I think that's why they hold better oil psi. IMO
"better bottom end"? like how? I completely disagree. If you have an LLY short block sitting next to an LB7 short block can you tell the difference? Because I sure cant.......

Unless its an early 01, you can tell those apart from 02-05 short blocks because they are missing an extra mounting boss on the side of the engine next to the block heater.
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Last edited by duratothemax; 06-28-2010 at 02:02 PM.
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  #24  
Old 06-28-2010, 02:47 PM
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Quote:
Originally Posted by duratothemax View Post
"better bottom end"? like how? I completely disagree. If you have an LLY short block sitting next to an LB7 short block can you tell the difference? Because I sure cant.......

Unless its an early 01, you can tell those apart from 02-05 short blocks because they are missing an extra mounting boss on the side of the engine next to the block heater.


Easy big guy I said in my opinion, I thought that the lb7's bottom ends were strong then the lly's, easy
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  #25  
Old 06-28-2010, 02:58 PM
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sorry I completely didnt mean it to sound like that. :

no, LB7 short blocks are the same as LLY's. Seeing as the LLY came after the LB7 im not sure why GM would make it weaker...
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  #26  
Old 06-28-2010, 03:30 PM
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Which oil did you go with Ben?
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  #27  
Old 06-28-2010, 04:13 PM
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"napa performance" generic-whatever 20w-50.
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  #28  
Old 06-28-2010, 04:22 PM
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Quote:
Originally Posted by duratothemax View Post
that was a complete joke. Of course changing oil isnt going to make it faster or help turbo spoolup. : Im surprised it took several posts for someone to catch on and comment on it.
Damn Ben, that's the second time in a week you've got me with the sarcasm. I need to start paying more attention.
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  #29  
Old 06-28-2010, 06:59 PM
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Quote:
Originally Posted by duratothemax View Post
sorry I completely didnt mean it to sound like that. :

no, LB7 short blocks are the same as LLY's. Seeing as the LLY came after the LB7 im not sure why GM would make it weaker...

No worries Ben I was just given you a hard time,
but I always thought the LB7 bottom end would hold more hp, so I just thought saying that it would hold more oil psi, but hey I've alot to learn, an I always enjoy your thread, no disrespect I was just funnin' with u.
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  #30  
Old 06-28-2010, 07:53 PM
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Quote:
Originally Posted by duratothemax View Post
"napa performance" generic-whatever 20w-50.
Run a good oil weather it be with good dispersants for water and diesel soot

or a good shear strenght our oil heats up a ton in the diesel and then breaks down! I bet if you ran better oil u would find it held up and gave u better pressure after long hauls or hard runs


Just my opinion
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