When to change oil

[salem]

My truck (2016 Chevy diesel) gives me a percentage of oil usage left. At what percentage do you fellas normally change your oil? I normally will let mine get to around 12%-15%. Just curious if you change yours more frequently.

[Cummins12V98]

"Cross contaminating when they are side by side, doesn't require you to be gifted, just a big bowl of dumass in the morning"

That and high hitching a B&W puts you in a "Special" category.

[Cummins12V98]

cummins2014 wrote:

Lynnmor wrote:

cummins2014 wrote:

Grit dog wrote:
This thread gets funnier by the day!

They haven't even got into the debate about socket size for the front fuel filter here yet , whether you should go 28MM or 1*1/8" :B

1-1/8" is way too loose, let the debate start here. 😛

Yup, but some insist its good enough .

Have you tied the 1-1/8" six point socket??? NOT sloppy at all.

[Cummins12V98]

Lynnmor wrote:

cummins2014 wrote:

Grit dog wrote:
This thread gets funnier by the day!

They haven't even got into the debate about socket size for the front fuel filter here yet , whether you should go 28MM or 1*1/8" :B

1-1/8" is way too loose, let the debate start here. 😛

OK will bite.....NOT HARDLY. 1-1/8" = 28.575mm

I have removed three filter caps that were from the factory that were "Gorilla Tight" with a 1-1/8" six pt socket and many changes after that with ZERO damage to the cap.

[ksss]

FishOnOne wrote:

Cummins12V98 wrote:

FishOnOne wrote:
No drama... No special tools... No risk of contaminating intake system...You can simply prefill if you choose to...no spills...no frills... no surprises...no debates on which method to access the filter is easier

Yep and let’s not forget good mirrors.

Nice you have at least ONE easily accessible item.

At least you don't have to open the hood to fill the DEF tank.

Filling under the hood is a PINTA no doubt and personally glad they moved it. But the upside is if you cross contaminate those trucks with DEF in the fuel, you are truly gifted in a very special way. Cross contaminating when they are side by side, doesn't require you to be gifted, just a big bowl of dumass in the morning and there you are, down $15K when you eventually get your truck back.

[ktmrfs]

On the recomended change interval or the onboard oil life. I think there are many parts to this.

1) What detailed oil analysis and careful monitoring yields for oil life

2) What consumers will accept for change interval.

3) typical mileage/year for vehicles.

IMHO (2) wins out. For decades of "you must change oil every 3K miles" getting people to accept a 5K, 7500, 10K or longer oil change interval is hard.

GM solved (3) by having the DIC drop 2%/week to meet the "change the oil at least once/year". Some other mfg still have the once/year interval or DIC, but don't monitor time. I have once such vehicle, with covid we only drove it about 5K miles last year, oil life was down to 50%, but it had hit the one year mark, and no dash indicator to change oil.

[Groover]

4x4ord wrote:

Grit dog wrote:

p220sigman wrote:

FishOnOne wrote:

Grit dog wrote:
This thread gets funnier by the day!

It really does... :B

And the irony is that the vast majority of people change the oil (or more likely have it changed) when the vehicle tells them it is time.

Except 4x and that other guy who posted he goes double. I don't do UOA's. Don't care. I change on time or a little early or whatever my spidey sense says. Since the oil I'm "wasting" by not extending due to UOA or the 4x4ord theory costs me maybe 5 hundredths of one percent of my annual income. Or 0.0005/100.


Serious question. If Ram says 15k and Frod says 10k miles OCI, is the additional wear on Ford oil really 33% more, IE are Fords really 33% harder on the oil?

My question as well. Although unlikely, one possibility is that the Powerstroke runs at hotter temperatures which could conceivably cause oil to deteriorate quicker. Another possibility that I think might be more likely is that Ford comes up with their oil change interval based on automotive standards whereas Cummins comes up with Rams oil change intervals based on industrial standards. Industrial powered equipment often has 600 hr change intervals. These engines are used at about 80 to 110 % rated load all day long and often run in extremely dusty conditions. My spider sense tells me that North America car manufacturers make a lot of money off the service department and if they were to recommend extended oil change intervals they would loose out on a lot of money.

I hate it when I go into a car dealer and they have big signs in the service department saying that they recommend changing oil ever 5,000 miles, regardless of what the manufacturer says. That proves to me that your theory them putting profit ahead of need is correct.

[cummins2014]

Lynnmor wrote:

cummins2014 wrote:

Grit dog wrote:
This thread gets funnier by the day!

They haven't even got into the debate about socket size for the front fuel filter here yet , whether you should go 28MM or 1*1/8" :B

1-1/8" is way too loose, let the debate start here. 😛

Yup, but some insist its good enough .

[Lynnmor]

cummins2014 wrote:

Grit dog wrote:
This thread gets funnier by the day!

They haven't even got into the debate about socket size for the front fuel filter here yet , whether you should go 28MM or 1*1/8" :B

1-1/8" is way too loose, let the debate start here. 😛

[cummins2014]

Grit dog wrote:
This thread gets funnier by the day!

You think its funny here ,you should hear 12V ,and the boys over on turbo diesel forum. They haven't even got into the debate about socket size for the front fuel filter here yet , whether you should go 28MM or 1*1/8" :B . But the oil filter from the top or bottom is still the most highly contested debate, Oh ,and Amsoil !!!!!!!

[4x4ord]

Grit dog wrote:

p220sigman wrote:

FishOnOne wrote:

Grit dog wrote:
This thread gets funnier by the day!

It really does... :B

And the irony is that the vast majority of people change the oil (or more likely have it changed) when the vehicle tells them it is time.

Except 4x and that other guy who posted he goes double. I don't do UOA's. Don't care. I change on time or a little early or whatever my spidey sense says. Since the oil I'm "wasting" by not extending due to UOA or the 4x4ord theory costs me maybe 5 hundredths of one percent of my annual income. Or 0.0005/100.


Serious question. If Ram says 15k and Frod says 10k miles OCI, is the additional wear on Ford oil really 33% more, IE are Fords really 33% harder on the oil?

My question as well. Although unlikely, one possibility is that the Powerstroke runs at hotter temperatures which could conceivably cause oil to deteriorate quicker. Another possibility that I think might be more likely is that Ford comes up with their oil change interval based on automotive standards whereas Cummins comes up with Rams oil change intervals based on industrial standards. Industrial powered equipment often has 600 hr change intervals. These engines are used at about 80 to 110 % rated load all day long and often run in extremely dusty conditions. My spider sense tells me that North America car manufacturers make a lot of money off the service department and if they were to recommend extended oil change intervals they would loose out on a lot of money.

[kellem]

Retired and change oil once per year on every engine on the property.....don't drive much.

[larry_barnhart]

I change our Duramax's oil when this 80 year old body tells me and that time is very close. Once a year usually less than 7000 miles. Only drive it in the winter in Az for the 6 months we are there. Missed this last season but just maybe again this late September we hit the road. chevman

[Grit_dog]

p220sigman wrote:

FishOnOne wrote:

Grit dog wrote:
This thread gets funnier by the day!

It really does... :B

And the irony is that the vast majority of people change the oil (or more likely have it changed) when the vehicle tells them it is time.

Except 4x and that other guy who posted he goes double. I don't do UOA's. Don't care. I change on time or a little early or whatever my spidey sense says. Since the oil I'm "wasting" by not extending due to UOA or the 4x4ord theory costs me maybe 5 hundredths of one percent of my annual income. Or 0.0005/100.


Serious question. If Ram says 15k and Frod says 10k miles OCI, is the additional wear on Ford oil really 33% more, IE are Fords really 33% harder on the oil?

[p220sigman]

FishOnOne wrote:

Grit dog wrote:
This thread gets funnier by the day!

It really does... :B

And the irony is that the vast majority of people change the oil (or more likely have it changed) when the vehicle tells them it is time.

[ShinerBock]

FishOnOne wrote:

ShinerBock wrote:

FishOnOne wrote:
No drama... No special tools... No risk of contaminating intake system...You can simply prefill if you choose to...no spills...no frills... no surprises...no debates on which method to access the filter is easier

I would hope it would be easier based on how often you have to change your oil. Back when I was putting on 30k miles a year, the 10k oil change interval on the Ford would add another 7 oil changes over the course of 200k miles versus the 15k interval on mine.

And I'll take that any day of the week. I actually enjoy draining the sump and replenishing with new oil.

And I will take not having to do it more often. I know how long the oil lasts and what its max contamination holding capacity is with my sump according to UOA's from work, and I never get close to that. I can understand erring on the side of caution if you didn't have this info readily available though.