Oil Consumption

[Jettech1]

59 minutes ago, Grumpy Bear said:

Sliding vane pumps make noise. 

I know I know.  The only piece of the puzzle I'm missing is why it didn't make a peep before my first oil change?  That's what bothers me.  I'm trying so hard to figure that out and I keep coming up with nothing.

[diyer2]

How much does this noise bother you?

Switching to a 100% synthetic oil like Amsoil or Redline would make it quieter IMO. 

[Another JR]

14 hours ago, Jettech1 said:

I know I know.  The only piece of the puzzle I'm missing is why it didn't make a peep before my first oil change?  That's what bothers me.  I'm trying so hard to figure that out and I keep coming up with nothing.

It may be that a pressure-filling system of some kind they use at the factory clears a bubble that aggravates the drainback characteristic once you do a drain and gravity fill.  There’s not much we can do as diy maintainers other than pre-filling the filter when you replace it. Slight differences in viscosity aren’t likely to eliminate the issue. I don’t think this needs to be your primary selection criterion for the oil you use. 

[Pryme]

10 hours ago, Another JR said:

It may be that a pressure-filling system of some kind they use at the factory clears a bubble that aggravates the drainback characteristic once you do a drain and gravity fill.  There’s not much we can do as diy maintainers other than pre-filling the filter when you replace it. Slight differences in viscosity aren’t likely to eliminate the issue. I don’t think this needs to be your primary selection criterion for the oil you use. 

It’s very easy to pre fill the filter on this truck. I filled mine about half way before screwing it’s back in. Can’t hurt. 
 

the manual for our kohler powered mower specifically says to pre fill the oil filter. 

[John Rommelt]

https://www.raceenginesuppliers.com/Suppliers/deep-dive-gms-new-66l-l8t-v8

Here is a good article that explains alot

[John Rommelt]

This Article you should read

https://www.raceenginesuppliers.com/Suppliers/deep-dive-gms-new-66l-l8t-v8 

[Jettech1]

13 hours ago, John Rommelt said:

https://www.raceenginesuppliers.com/Suppliers/deep-dive-gms-new-66l-l8t-v8

Here is a good article that explains alot

That was a great read, thank you for the link!

[John Rommelt]

This Article you should read

https://www.raceenginesuppliers.com/Suppliers/deep-dive-gms-new-66l-l8t-v8

I just hope there is a way for General Motors to Correct the Oil Consumption, Oil Pump Problems.

I would like to order a GMC Savana 2500 with the 6.6L L8T Gasoline engine.

[the8rotor]

4200 HARD miles on my 2024 and zero consumption. I check every week or so and nada.

 

Also had over 32k on my 2021 6.6 and zero consumption. Harsh towing for those miles as well.

[John Rommelt]

21 hours ago, the8rotor said:

4200 HARD miles on my 2024 and zero consumption. I check every week or so and nada.

 

Also had over 32k on my 2021 6.6 and zero consumption. Harsh towing for those miles as well.

Excellent, Thank you

[John Rommelt]

On 7/3/2023 at 11:54 PM, Jettech1 said:

That was a great read, thank you for the link!

https://chevytrucks.org/l8t-performance-upgrades/

[Jettech1]

5 minutes ago, John Rommelt said:

https://chevytrucks.org/l8t-performance-upgrades/

I read that article not too long ago.  I think it's very cool although there is no way in hell I would pay the premium for one.  But it is very cool!!

[John Rommelt]

30 minutes ago, Jettech1 said:

I read that article not too long ago.  I think it's very cool although there is no way in hell I would pay the premium for one.  But it is very cool!!

CORRECT! (Super Charger) Ouch $

Trifecta has been working on Cracking ECU and HP Tuners I think is working with Trifecta Performance.

I Can see Tuning Doable, and Exhaust.

Edited July 14, 2023 by John Rommelt

[Dustin Marshall]

Back on topic.

 

2024 GMC 2500HD AT4 w/ 6.6L L8T.  Only 4300 miles, so still early...so far I'm happy to report no oil consumption.  Really enjoying the L8T w/ 10 speed 'Allison'.  Nice smooth and refined drivetrain.  Definitely quieter, smoother with more refined shifts vs the Ford 7.3L w/ 10R140 (I've owned both).

[waltman]

I have since traded the truck in I originally started this thread about but I'm convinced it was probably something like the PCV system acting up because it was only going through oil for about a month and then it stopped and never came back.