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Add engine oil!!!

Truston Gunter

By Truston Gunter
in 6.6L Gas V8 (L8T)

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lundimpact1775 Enthusiast

lundimpact1775

Posted
Posted
13 hours ago, Grumpy Bear said:

 

There is. AN fittings. 

I'm interested in this, been doing some reading. I'll probably plan something out and proactively replace before they fail again. But it's getting new lines now so I should be good for 40-50k more, right? Right?!

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Flatus
Flatus

Mine burns excessive amounts of gasoline.

diyer2
diyer2

While I have never approached things like an engineer would, I have just kept motors in an as new condition and changed the oil and filters. I do applaud the science part but never used it and never h

MacLaren
MacLaren

Ok fellas, I've got a 2021 Gasser, just took in for an oil change (every 5k) and, they told me she wasn't even low. And, we've been on 5 camping trips during this 5,000 mile stretch. We haul an 11,000

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lundimpact1775 Enthusiast

lundimpact1775

Posted
Posted

GM decided to cover my oil lines in full. 99,200 miles just fyi in case anyone needs them replaced be sure to press for that 100k power train warranty. Oil lines and associated hardware and labor are listed as covered.

Flatus Enthusiast

Flatus

Posted
Posted
17 hours ago, lundimpact1775 said:

GM decided to cover my oil lines in full. 99,200 miles just fyi in case anyone needs them replaced be sure to press for that 100k power train warranty. Oil lines and associated hardware and labor are listed as covered.

The gasser only comes with a 60k mile power train warranty.

Chuck FB Enthusiast

Chuck FB

Posted
Posted

While somewhat useless to mention this at the low miles I have on my truck which is around 600 ( I plan to drop the oil on it before its driven further ) I have not observed the oil drop at all since it was new. Mind you I had 100 miles on it by the time I had it home to park it in the exact spot it is now to accurately check the level but had checked it as it sat level in the show room and read the same. Its about 1/8 of an inch above the full line. Time will tell with more miles on an oil change and for the present I decided to buy some Mobil 1 Truck and SUV 5W-30 as it came on sale at "Crappy Tire".

  • 4 weeks later...
Chuck FB Enthusiast

Chuck FB

Posted
Posted

Speaking of pouring oil into the L8T engine at time of changing oil or if one needed to add some oil, I had ordered a funnel kit  not long ago from Lisle which has the funnel, an elbow to get the right angle for the L8T so the funnel sits upright, and the various adapters that come with it and yes one is for the GM/Ford style and it screws in just like the oil cap. Since the funnel has a top cap and bottom cap its possible to cap off both ends to keep debris out and also throw into a plastic bag to be sure it stays clean. I just used it today for the first time on my truck and it seemed to work slick, way better then the conglomeration of what I had temporarily used initially. There are cheaper alternatives to this brand but the concept works and way less chance of spilling oil vs some funnel that was never made for the poorly thought out angle of the oil fill port.

 

https://www.lislecorp.com/lubrication-and-tire-products/19912-multi-application-oil-funnel-set-14-pc

Pryme Senior Enthusiast

Pryme

Posted
Posted
38 minutes ago, Chuck FB said:

Speaking of pouring oil into the L8T engine at time of changing oil or if one needed to add some oil, I had ordered a funnel kit  not long ago from Lisle which has the funnel, an elbow to get the right angle for the L8T so the funnel sits upright, and the various adapters that come with it and yes one is for the GM/Ford style and it screws in just like the oil cap. Since the funnel has a top cap and bottom cap its possible to cap off both ends to keep debris out and also throw into a plastic bag to be sure it stays clean. I just used it today for the first time on my truck and it seemed to work slick, way better then the conglomeration of what I had temporarily used initially. There are cheaper alternatives to this brand but the concept works and way less chance of spilling oil vs some funnel that was never made for the poorly thought out angle of the oil fill port.

 

https://www.lislecorp.com/lubrication-and-tire-products/19912-multi-application-oil-funnel-set-14-pc

114.00 for funnels? Wow. The 12 dollar lisle right angle funnel works awesome for this truck. 

Chuck FB Enthusiast

Chuck FB

Posted
Posted

I had thought about the funky funnel by Lisle which I think is the one you are referring to but the price was considerably more than what you paid, when I realized I could get this funnel kit for just over 80.00 Canadian through a certain local supplier ( far less than what the USD MSRP is on that funnel set ) I decided to spend the extra and get it as it caps off both ends and won't have to wash it out each time. Ironically right after this unit came in, I then discovered Princess had a unit they were selling on a clearance sale that never came up in a prior search and it was marked down to 20.00 ... oh well, a bit too late by then but I bought it too so I can throw it in the truck if I am on a trip and ever needed to add oil. Its not the same quality unit but it it should work fine too, just how things played out when I was searching and not finding much for alternatives on this side of the border. There were all sorts of things I could find in the states but made zero sense to try and order as I would have paid many times the price with all the skimming with shipping and brokerage etc.  GM could have come up with a design that incorporated an elbow so the inlet faced up so any funnel would have worked, poorest designed fill port I've ever worked with over all the vehicles and farm equipment over the years.

  • 1 month later...
Truston Gunter Enthusiast

Truston Gunter

Posted
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Posted

Here's a minor update. Last oil change was 3/7/25 @ 59,261. No longer using this truck as my daily driver, its only driven when "truck" abilities are needed. That said, checked oil on 6/17/25 before a camping trip and it was a qt low. At that time milage was about 60,518. This still falls below the threshold that GM says is normal (1 qt per 100 gallons of fuel). Here is a screenshot of us  driving home southbound on I37 outside San Antonio to Corpus......Now before I get ridiculed for driving too fast I really don't see an issue driving the speed limit while towing. The traffic was minimal and there is absolutely no sway but the MPG's are insanely low!!! This may not be the right place to ask this but does anyone else get this type of fuel mileage??? My camper is not heavy but it guess it likes to catch wind. Truck constantly down shifts on minor hills, I tend to keep it in L5 that way I can lock it in 4th to minimize shifting with the press of a button, then back to L5 for straightaways.

20250621_171712a.jpg

MORSNO Enthusiast

MORSNO

Posted
Posted
31 minutes ago, Truston Gunter said:

Now before I get ridiculed for driving too fast I really don't see an issue driving the speed limit while towing. The traffic was minimal and there is absolutely no sway but the MPG's are insanely low!!! This may not be the right place to ask this but does anyone else get this type of fuel mileage??? 

 

The low mileage issue is "You're driving too fast".  There is a massive mpg difference if you slow down, and I mean massive compared to 4.5mpg. 

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Chuck FB Enthusiast

Chuck FB

Posted
Posted

When the truck in the past was driven without the trailer and from the starting point of a fresh oil change, what distance was it able to obtain before being down one quart ?. 

 

I've been on that stretch of highway once and heading northbound but its so many years ago and most of the drive was at night but isn't that a fairly flat stretch of highway ?. South bound you would drop 700 feet between those two cities and at those low elevations is where I have found vehicles to get the best fuel mileage, if all else is equal with fairly flat ground and no headwind vs high elevation. But speed with a high wind resistance unit, that kills fuel economy and the amount of power required is vastly higher than if one was idling along at 55 to 60 mph with the same unit. 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

I would love to see the oil and trans fluid temperatures running like that. MPG would be the last of my worries. 

Truston Gunter Enthusiast

Truston Gunter

Posted
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Posted
7 hours ago, Grumpy Bear said:

I would love to see the oil and trans fluid temperatures running like that. MPG would be the last of my worries. 

Not sure what oil temp was but I monitor trans temp at it was steady at 196 degrees. It does creep up to 206 in stop and go traffic but comes back down. While driving without a trailer its usually around 185-190.

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Truston Gunter Enthusiast

Truston Gunter

Posted
  • Author
Posted
11 hours ago, Chuck FB said:

When the truck in the past was driven without the trailer and from the starting point of a fresh oil change, what distance was it able to obtain before being down one quart ?. 

 

I've been on that stretch of highway once and heading northbound but its so many years ago and most of the drive was at night but isn't that a fairly flat stretch of highway ?. South bound you would drop 700 feet between those two cities and at those low elevations is where I have found vehicles to get the best fuel mileage, if all else is equal with fairly flat ground and no headwind vs high elevation. But speed with a high wind resistance unit, that kills fuel economy and the amount of power required is vastly higher than if one was idling along at 55 to 60 mph with the same unit. 

Since this was my daily driver up until recently, a few times that I have gone between oil changes without towing and in those circumstances I do not have major oil consumption. It maybe consumed a quart after 6K miles which is typical in my experience. Even in my previous trucks with the 5.3L their was some oil consumption. The trip back is mostly flat and going southbound is "downhill". The slight incline for overpasses causes the truck to downshift which is why I lock out 5th and 6th sometimes.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
11 minutes ago, Truston Gunter said:

Not sure what oil temp was but I monitor trans temp at it was steady at 196 degrees. It does creep up to 206 in stop and go traffic but comes back down. While driving without a trailer its usually around 185-190.

 

More cooler to bring the temperature down under 175 F, preferably @ 160 F, during your heaviest/hardest/worse case tow would lengthen it's life by multiples. Not meaning to step on toes with unsolicited advice but I feel for machines. :) 

 

Just say'n. 😉 

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