Check it out.................

http://www.chevyreviews.com/chevy_reviews/02_chevrolet_silverado_2500hd_3500_driv_imp.html

The article says Duramax:

"designed for a 200,000-mile operating life with 10,000-mile oil change intervals"

Is there anyone using dino oil changing it near
10,000 mile use?

Using RotellaT Synthetic and changing at about 10k miles. Did run dino one time to 8500 miles.

I did a UOA with a 7500 mile OCI using Delvac 1300 on my second oil change. Blackstone suggested I shorten the interval next time. I went 5000 on the next, and will change this current OCI out at 5K and do a UOA.

I was up around 7,500 miles on my last change of Delvac 1. AVLube analysis didn't note any problems.
Still in double digits, though, on dirt using the Uni filter so changed to paper for the next cycle. Will do another test then.
TC

I was changing my Delvac1 every 5k. The problem with 10k is not the oil breaking down. The problem is the additives getting used up and the abrasives that accumulate in the oil.

From what I understand the most damaging dirt particles in the oil are silicon/sand (which coincidentally enters through the air intake system). The most damaging particle range for this silicon/sand is in the 5-10 micron range.

Most oil filters are only capable of filtering down to the 20-30 micron range. Some dirt can be handled by the oil and its additive package. Once enough accumulates then the engine will wear more quickly. Therefore we change the oil to flush out the dirt and refresh the additives.

The only real alternative to changing the oil frequently that I am aware of is to use a good bypass filter. I researched them all. At first I thought it was another thing that guys who like to tinker put on their trucks for fun. I was spending $50 on oil and another $10 on a filter every 5k miles. I was throwing away perfectly good oil because it was getting a little dirty.

So I decided to get an Oilguard bypass. It continuously filters the oil down to 1 micron nominal, 3 micron absolute. At typical cruising speed my sump of oil is filtered to this level every 7 minutes. With the oil being constantly filtered the additive package is minimally stressed. Oilguard guarantees that you can double the suggested OCI, and even quadruple it with oil analysis as a safeguard. The system will pay for itself in less than 2 years even if I change the oil every 10k. I will be doing an oil analysis at the first 5k and 10k to compare the results with oil analysis before bypass install.

Sorry to ramble on. To answer your question, with dino or not, I think 10k miles is too long with conventional filtering. SPICER

I now go until the DIC reads about 35-40% life remaining, and then I change oil and Baldwin filter. Presently using Shell Rotella Synthetic 5w-40

I've been using a 7500 mile interval. I got stuck "in transit" and did go 9300 miles on one charge of Rotella-T 5W40 "synthetic." My analyses have all been good and not a problem, even on the extended one. I do, however, run an Amsoil dual-remote filter setup. I could probably stretch to 10K intervals with no problem with the Amsoil, but I feel comfortable with the 7500 mile changes and it fits nicely into a 15,000 mile "every other" routine for the bypass filter cartridge and my OEM fuel filter.

I didn't have the guts to run 10k with dino, but was willing to try with synthetic. I plan on running a 10k OCI on the Schaefer's 15w-40 and doing an analysis to see what it looks like in my engine. I have read many good reports from the Schaefer's oil, even though it is a synthetic blend. Have another 8k to run, so it might be a bit before I know whether or not I can do 10k changes in the future.


Bob

I run regular oil to 10,000 Km's or (6250 Miles). 10,000 miles is an Impressive interval with no aux filtration.

k1xv wrote:

"I now go until the DIC reads about 35-40% life remaining"

How do you get the 2002 Truck DIC to show that information?

Also, my point in posting the article is that why in the world would
GM make a statement that their engine was designed for
10,000 mile interval oil changes, when in fact the owners
manual states 7500 miles..........

My 2004 owner's manual says 10,000 miles is the recommended change interval under "normal driving" conditions. The DIC oil life remaining information is also based on a 10,000 mile interval.

How do you get the 2002 Truck DIC to show that information?



A Predator will allow you to look up the life on an 02. I don't know of any other way.

k1xv wrote:

Also, my point in posting the article is that why in the world would
GM make a statement that their engine was designed for
10,000 mile interval oil changes, when in fact the owners
manual states 7500 miles..........


I think the owners manual you are making reference to here is the general "Silverado" owners manual for all Silverados. You need to ignore anything in this manual with regards to the engine and tranny. The Duramax Diesel supplement you should have received indicates 10k miles for oil change interval. SPICER

SPICER wrote:

"I think the owners manual you are making reference to here is the general "Silverado" owners manual for all Silverados. You need to ignore anything in this manual with regards to the engine and tranny. The Duramax Diesel supplement you should have received indicates 10k miles for oil change interval"

My 2002 Duramax Diesel Supplement page 7-7 says Long/
Trip/Highway interval..... diesel Every 7500 miles NOT
anywhere a mention of 10,000 miles.

56Nomad:


I don't know what information your 2002 DIC shows, but I can see that information on my 2003 GMC DIC. It is in the group of information that includes fuel economy data. One piece of info is remaining oil life, expressed as a percentage. When you re-set at an oil change, it goes back to 100%.


In my non-towing non-city drive mode, waiting until it indicates 35-40% life remaining works out to about 6000 miles or so.

I did not like the idea of going 10k before changing my oil. I run Schaeffer's 7000 15w-40 Syn Blend. I will change at 7500, running UNI, and have my OA kit ready. When I change, I will put ACdelco paper back on, run another 7500, and then another OA. If the results are different with any significance, I will post them.


10K is too long with standard filtration, no matter the oil.

I've always changed all my diesels at 10,000 for years now. The big rigs have been doing it for 40 years now and they put way more miles on in a single year than most of us will put on our truck for the duration of owner ship. There engine are no different except they haul much larger loads for the entire length of there existance. My cousin runs a fleet of Peterbuilts, Volvos, KWs, and FLs. The oil company are making out good on us. Super Diesel

Super Diesel, the Big Trucks generally run all day or 24 hours a day keeping the motor with-in operating temps while our trucks see a nightmare of warm up/cool downs every day. Would that not make a difference? What about the rpm's? Most of the trucks I see will not turn over 2,300 RPM and ours 3,200 + RPM, plus ours row RPM constantly. The parts.... there monsters compared to ours.





Burner---------------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

Likely the biggest difference with the big rigs is the sump capacity. I expect that the ratio of engine size in liters vs oil capacity in liters would be much lower with a N14 cummins or a 3406 Cat vs the DMAX. Larger sump capacity should equal a longer drain interval.

I am using Amsoil and the Amsoil filtration BMK-17 bypass system. I havent changed the oil yet (1,000 miles on the system), but I will get the analysis kit around 3K.


Thus far, I have been changing the oil every 5k due to the Duramax supplement stating that if you have frequent short trips and drive in mainly stop and go traffic, the interval is 5K.





PS. I havent been able to make the oil life light go on past 5K (stellar performance from the dealership not resetting the oil life)

Cummins has recomened since 1984 to change the oil in the 5.9 every 10,000. Cummins not Dodge says this. The trucks my cousins owns are not over the road trucks. They are rock trucks. They get shut down and restared all day long. We just need to do what we feel comfortable with. Just giving a heads up, not a recomendation. Super Diesel

It isn't just GM using 10k intervals. Mercedes-Benz, Porsche, BMW, all use 10k or longer drain intervals. Further, oil analysis has shown these to be safe intervals. My new Porsche states a 20k drain interval on synthetic, not sure I am THAT brave but 10k has proven do-able by fellow Porsche owners using oil analysis and dino oil.

The other thing is, I will not own this truck beyond its 100k engine warranty. I have zero faith in the 200k claim before problems occur. There are way to many trucks with injector problems out there. I traded off my '01 D/A at 97k miles. So....it is pointless for me to exceed the requirements at my expense.

I am still going 6k miles with Delvac 1300 and Baldwin filters. I'm at 63k and plan to go at least 263k.

The other thing is, I will not own this truck beyond its 100k engine warranty. I have zero faith in the 200k claim before problems occur. There are way to many trucks with injector problems out there. I traded off my '01 D/A at 97k miles. So....it is pointless for me to exceed the requirements at my expense.





I am in it for the long haul, and have faith that this injector problem is solved or will be soon!

Way to hang in there Diesel Dually. Couldn't have said it better. I love this truck, and I'll put it out to pasture befor I off it. GM does my oil changes every 3500 to 5000 right now (smart care), but when I do it, it will be every 10,000 or so.

I use Delvac 1. My last interval was 8k with a new filter at 4k. Test looked good so this time I am going 10k oil 5k filters. I'll do another oil test after that. To get the % on on 2002 you don't need a DIC or a chip. The thing just rolls around every 10k. No variables on mine any how. 5k is 50 %, 7,500 miles 25%, 9,000 miles 10% etc. It seems they must endorse the 10k on dino based on the DIC interval. I always just changed dino at 5k on my '02.

I just looked at my 04 owners manual and diesel supp. last nite (first time ever) and it has 10,000 mile on Dmax.


I ran Schaeffers 15w-40 blend back in mid 90's in coal buckets w/ cummins motors hauling asphalt and gravel local.


The stone hauler moto 'HEAVY,FAST and CHEAP'


Ran 25,000 miles (15,000 and 20,000 mile samples) sent in my sample at change and they said go some more next time.


But never went more than 25,000 miles.


The Schaeffers stuff is the best IMHO.

The hour meter is really the way to go. I guess, we have been accustomed to the "mileage" thing. I think that every truck from 2000 up has the hour meter. How many of you check the hours when you drain the oil? What about the samples, do they have hours on them?


What gets me.......... I can start my truck and let it run @ idle for 12 hours and the % doesn't seem to move much, if any. However, I can drive to the beach and back, about 8 hours or 600 miles, and it drops about 2 or 3 points, could be more. I'm not the best with numbers.......


1 minute = 750 RPM @ Idle


1 hour @ 750 RPM = 45,000 RPH


12 hours @ 45,000 RPH = 540,000 Revs


-----------------------------------------


Driving @ 2,200 RPM for 8 hours


1 minute = 2,200 RPM


1 hour = 132,000 RPH


8 hours = 1,056,000 Revs





Mileage on "sitting truck" is a fig fat "0" and the one going to the beach is 600.





....... What gets me here is that the motor is under slight duress when it's idling for along time, not when it's under a light load. So how can you really change the oil using the mileage and not the hour meter?


Maybe I'm way off?





Burner--------------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

If you idle a lot or are in heavy traffic the DIC % is pretty useless because it simply clocking down the remaining % of a 10k interval. I drive mostly highway so 10k miles is 200-220 hours. My '02 supposedly had a hour meter but I never figured out how to use it. The '04 is about as simple as it gets.

FYI....... if you have a 2000, 2001 or 2002 you can see the hours. While the truck is off (keys out), press the mileage reset button for 5-7 seconds. Your hours should display for about 10-15 seconds.

On the new Isuzu Diesels sold in Opel (GM Europe) passenger cars they have oil change intervals of 50000km (31000mi).
Those are fast revving high output engines 1.7L-100hp same as if the Dmax had 388hp.

Lennart

I change mine every 10k miles.


I change the oil in my 6.5 diesel every 7500 miles, it only holds 8 liters and isn't as clean as the dmax.

Every 10k whether it needs it or not.


Mobil Delvac1 pure syn.

you guys want clean oil even removes the soot--- but dam pricey harvardcorp.com. oil stays as clean as it came out of the bottle, I was gonna try one but the elements are 50 plus. You get adapter and have to build the rest your self (bracket & lines). It is a by pass system.


Geno

you guys want clean oil even removes the soot--- but dam pricey harvardcorp.com. oil stays as clean as it came out of the bottle, I was gonna try one but the elements are 50 plus. You get adapter and have to build the rest your self (bracket & lines). It is a by pass system.


Geno

The cheaper alternative would be a FRANTZ filter. It is a bypass type system that filters only a fraction of the oil at a time but does it much better than any full-flow type filter. Check out http://www.wefilterit.com/ for more information.