Filter Intervals - Page 5 - Chevy and GMC Duramax Diesel Forum
Maintenance Discuss scheduled maintenace, capacities, filter part numbers, etc.

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post #41 of 59 (permalink) Old 12-05-2019, 10:42 AM
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Originally Posted by HWI View Post
I think I am one of the few who just goes by the DIC for oil changes.
I do as well. I know I could extend drain intervals using UOAs but my OLM is a 2-3 year cycle which I'm fine with...

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post #42 of 59 (permalink) Old 12-05-2019, 11:38 AM
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Originally Posted by 6686L View Post
……………………………………………………………………………………………………….
I suggest your assumption is not necessarily valid. I do not know what the typical oil-change intervals for the big OTR rigs, but I suspect they are much MUCH farther apart than we with "consumer grade" equipment.

I suspect filtration is a major issue - plus monitoring. I can report my own situation - my oil stays MUCH cleaner MUCH longer these days, even tho my driving conditions havnt changed ( heavy trailer pulling on long often incredibly hot grades here in Southern California and Arizona).

Whether my cleaner oil is due to "certain adjustments" to my trucks pollution equipment, or the use of a commercial grade oil filter...I have no idea, nor way of proving.

Bottom line - I suggest you are jumping to conclusions based on limited data about how others operate their equipment.
I presented facts to my application in response to the zero data assumptions that what I was doing was wrong. I am not telling everyone to start doing 40,000 miles oil change intervals. I am presenting facts that I have done it without trashing my engine. GM says you can go 10k with conventional oil in which they have data to go along with that. Some people are saying you need to do 5k intervals no matter if you using conventional, semi or full synthetic oils, towing or not, hot/cold, uphill/downhill, and they doing this based on zero data just feelings.

I have spent the past 28 years looking at all types of engines from small gas to heavy equipment diesel and asking questions. My customers have provided me an enormous amount of helpful real world data that I have used on my own personal vehicles/equipment with great success. In the 18 years since the duramax has been out I cannot remember one single oil related failure being reported by any of my customers which include GM dealerships, quick lubes, private shops, personal customer vehicles, farm/ranch, etc.

So lets keep sharing all of our own real world data to hopefully help someone make an informed decision.

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post #43 of 59 (permalink) Old 12-05-2019, 04:25 PM
 
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Quote:
Originally Posted by sethmorris View Post
Coming up on 40k miles and a couple of questions related to filter intervals on my 2016 LML.

I bought my truck from a dealer that does lifetime oil and filter changes with a dedicated diesel mechanic so oil/filter is every 5k. Usually ends up around 35% on the gauge.

For the fuel filter, I planned to follow the gauge but found some conflicting information. I went ahead and did the fuel filter at 30k because honestly, I cant figure out what you are supposed to do. the manual states 22,500 miles or two years but at 30k miles and almost 3 years the gauge was at over 50%.

For the transmission, I haven't changed the spin on yet. Manual seems to refer to 45k for spin on and then a full service at 90k. I'm not towing a lot and my transmission temps are under 100 degrees most of the time. Does that seem right?

I was going to do transfer case/diffs at 50k (understood those aren't filters <img src="https://www.duramaxforum.com/forum/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />)
When I bought my 2011, the dealer provided 3 or 4 oil changes and said to come back when the DIC showed 5% life left. After they stopped providing oil changes, they advised I should come in every 5000 miles. Now, I change my own oil at 25% life left in the DIC and change the fuel filter every Sept-Oct because it's cold in Iowa and Iowa bio diesel is crappy. I drive between 10k-12k per year.

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post #44 of 59 (permalink) Old 12-05-2019, 04:53 PM
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If you have a liftpump you could install a psi gauge at the engine then have a baseline with a new filter.
1st picture showing LP and stock filter fuel psi.
When the psi drops you might consider a new fuel filter, I have mine set at 6 psi as low.
Base with a new filter on my LP is about 8.5-9 psi and about 8 psi at the stock filter with 5 being low and time to change the stock fuel filter all psi readings when idling.

No liftpump you could invest in a vac/psi gauge, I went with Kennedy it costs a little more but you get everything you need ready to test and it’s a quality product.
2nd picture;
3rd picture shows psi liftpump running
4th liftpump off showing vac.

When you do a service connect it and check to see if it’s getting time to change your fuel filter
It’s much better knowing than wondering if it really needs changing.
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post #45 of 59 (permalink) Old 12-05-2019, 08:25 PM
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Quote:
Originally Posted by AlisoBob View Post
Wizzy... trains hold what, 300+ gallons of oil?

Their solution to pollution, is dilution .....

I don't know the actual capacity but I know they talk in terms of barrels, not quarts. My point wasn't that analysis was the only way to go. It was that if you are going to go 40,000 between changes it is a reasonable thing to do if you do analysis and the analysis supports it. Otherwise it is best to stick with something way more conservative.
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post #46 of 59 (permalink) Old 12-06-2019, 07:57 AM
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Nice EGT gauge, how do you like it? I was considering the same for my LMM.


Quote:
Originally Posted by D_R_C View Post
If you have a liftpump you could install a psi gauge at the engine then have a baseline with a new filter.
1st picture showing LP and stock filter fuel psi.
When the psi drops you might consider a new fuel filter, I have mine set at 6 psi as low.
Base with a new filter on my LP is about 8.5-9 psi and about 8 psi at the stock filter with 5 being low and time to change the stock fuel filter all psi readings when idling.

No liftpump you could invest in a vac/psi gauge, I went with Kennedy it costs a little more but you get everything you need ready to test and it’s a quality product.
2nd picture;
3rd picture shows psi liftpump running
4th liftpump off showing vac.

When you do a service connect it and check to see if it’s getting time to change your fuel filter
It’s much better knowing than wondering if it really needs changing.
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post #47 of 59 (permalink) Old 12-06-2019, 09:36 AM
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I've got a question for you guys about oil & filter changes . I purchased a 2019 Chev Silverado 3500 in August, I have 3000ks on it now and wondering about engine oil breakin of engine etc. . I'm thinking I want to change oil & filter before scheduled oil change to get what stuff might be in there out for it being new.Then would just do the regular changes when scheduled, what are your thoughts . Take Care

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post #48 of 59 (permalink) Old 12-06-2019, 09:51 AM
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Quote:
Originally Posted by Haywire View Post
I've got a question for you guys about oil & filter changes . I purchased a 2019 Chev Silverado 3500 in August, I have 3000ks on it now and wondering about engine oil breakin of engine etc. . I'm thinking I want to change oil & filter before scheduled oil change to get what stuff might be in there out for it being new.Then would just do the regular changes when scheduled, what are your thoughts . Take Care
The Duramax engines are VERY easy on oil. If it was my truck, I would just run it until the OLM says it's time for an oil change. If that seems too long, you could change it when you reach 8000 km/5000 mi...

My .02’

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post #49 of 59 (permalink) Old 12-06-2019, 10:02 AM
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but do you think it should be changed now, because of the broken in period of it being new maybe stuff in the oil from being new,or is that something of the past

2019 Chev Silverado LTZ Crew Cab 3500hd Duramax
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post #50 of 59 (permalink) Old 12-06-2019, 10:52 AM
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Quote:
Originally Posted by Haywire View Post
but do you think it should be changed now, because of the broken in period of it being new maybe stuff in the oil from being new,or is that something of the past
That’s what ya filters for
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