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  #1  
Old 03-07-2002, 04:08 PM
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oil change intervals

I was talking with a friend of mine today who has been driving big rigs the last year.(For Werner--one of the largest trucking companies around) He told me that the oil change interval on his diesel tractor trailer was between 3200-3600 gallons of fuel which equated to between 20,000-25,000 miles. This high mileage change was not from neglect but was specified by the mfg. They usually get about 500,000 miles from an engine.
Why is there such a long period between oil changes in these vehicles which see extreme duty and in autos the oil change interval is much shorter? (By the way, they use 15-40w oils in the trucks)
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Old 03-07-2002, 04:59 PM
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Those big dudes hold about fifty quarts. It takes a long time to wear out that much oil.
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Old 03-07-2002, 05:37 PM
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My friend told me his engine held only 13 liters.
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Old 03-07-2002, 05:55 PM
SW SW is offline
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I have read that the companies that own these beasts rely heavily on scheduled oil analysis to determine when the oil is changed. Also, I think many of those engines are equipped with bypass oil filters.
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Old 03-08-2002, 08:12 AM
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I have owned eight tractors and never had one with less than 42 quart capacity. The oil pans on those things are as big as an ironing board!
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  #6  
Old 03-08-2002, 09:37 AM
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Carla,
A bypass filter taps into an oil line where there is low pressure and filters a small amount of oil at a time. Apparently these filters can screen out particles as small as .5 microns which I think is pretty amazing. I think one of these filters with Mobil Delvac 1 would be an ideal set up. As for cost, I forgot exactly how much it is from Amsoil, but I remember it being close to $200. Is it worth it? I don't know. But, I really want one so I'm seriously considering it. Hope this helps.

Alex
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Old 03-30-2002, 02:01 PM
Don Stevens
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Extended drain intervals

The big rigs do normally go 20000 miles or so between oil changes and yes oil capacity is a variable in how they can go so long.

Bypass filtration is a big factor too.

The biggest variable though is load factor. 90% of the time they are cruising at a constant 2000 RPM with just the force of the wind they are moving against them. That is the easiest loading one can put on an engine. If you drove your car the way they drive these trucks and you had a bypass filter you could go 20K on regular oil too. Probably 50K on synthetic.

The way we drive is much tougher on oil. one three thousand mile journey is 10 times easier on oil than 1500 2 mile trips to the grocery store.

Check this thread ofr oil anlaysis results on extended drains.

http://forums.maxima.org/showthread.php?s&threadid=100060

E-mail me for a nice discount on Amsoil's bypass filtration system.

Don
www.lubedealer.com/dstevens
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Old 03-30-2002, 04:51 PM
LarryBible
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The two main reasons they get by with this have been touched on in this thread.

1. They hold an enormous quantity of oil and have huge specialized flitration.

2. If the service you give your car is to get in, start it up and drive coast to coast, stopping for nothing but food and fuel, you could probably safely extend your interval as well, but not to 20K. The heat/cool cycling allows acids to form and moisture to accumulate, using up the additives in the oil.

I recommend that you not try to use criteria for one machine and application for another. It is always unscientific to use apples data on an oranges application.

Have a great day,
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Old 03-30-2002, 07:37 PM
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Mercedes Diesels have a built in bypass filter. Why put another one on?

I these big rigs changed oil even every 10,00 miles, some of them would be changing the oil every month or less. I.E. very expensive.

Since my 300SD holds twice as much oil; (8 liters) as some other cars (4 liters), it should go twice as far between changes.

P E H
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Old 03-30-2002, 10:55 PM
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oil drain intervals

guys this topic is apparently less covered on this forum than on the tdi club forum etc. The only way to properly set your oil drain intervals is through oil analysis. Do yourself a favor and buy a kit. They are around $14 and simple to do. Just till a few ounces of your oil in the container and send away, results in a week or so. This will tell you the exact amount of soot, contaminants, wear metals, etc in your oil. Some places to get this are
www.oaitesting.com
www.avlube.com
www.amsoil.com
www.oilguard.com (also sells bypass systems)

The two oils most commonly referred to by experts as the absolute best for diesel engines are:

Mobil Delvac 1 synthetic (5w-40)
Amsoil Series 3000 Synthetic Heavy Duty Diesel Oil( 5w-30)

Anyone using dino oil - rotella t or otherwise, is simply getting less protection.
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  #11  
Old 03-31-2002, 08:18 AM
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TXBILL,

Yes, liters are larger than quarts but only by about 5%. So for most practical purposes they are the same.

Actually I use quarts because its hard to buy a liter of oil in the US.

Yes, thats how it works, the more oil in the engine, the less need for oil changes.

Your owners manual was printed before the advent of synthetic oil so in that respect it is obsolete. The new manuals specify many more miles between changes. I think we all know that synthetic oil protects twice as long as dino oil and better overall even with the extended changes..


P E H
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Old 03-31-2002, 03:15 PM
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tx bill. Do what you want Dino-is fino, but synthetic is the best. As for your switch, its hard to tell why you had probs, what synthetic did you try, was it rated for diesels?Also don't know whats going on with your engine as far as miles, deposit formation, etc. Its highly possible you burned a lot of the synthetic away because it was cleaning out all the junk in your engine. The detergency is unmatched by dino. There are plenty of ppl running older MB diesels with awesome results on Delvac1 5-40 and amsoil series 3k. They'll run 5000 miles on an oil change and after analysis its in twice as good of shape(cleaner, more viscosity retention, less tbn depletion,etc) as your delo dino would have at 3000.

Kerry, take it all with a grain of salt. These differences are only appreciated by the 'anal' care care fanatics like myself. You WILL most likley notice a 1-3 mpg improvement with synthetic tho.

Make absolutely sure it's a diesel synthetic. Don't go putting regular mobil 1 or castrol syntec in there. Make sure its a CG-4 or CH-4 rated diesel oil. This is the same as for dino. Delo and rotella etc are diesel rated oils as well. The special rating indicates their ability to suspend soot, and the special chemical additives that deal with diesel blowby, etc. A CF rated oil(gasoline cars) will be abused by your diesel, and won't hold up as long or protect as well.

As for the big rigs going on longer drain intervals, ppl are correct. Bigger capacities and bypass filtration systems. I'm not sure about yours, but my '99 mercedes has a bypass filter built in, and I bet yours do too. Its nothing significant like the truck's huge ones, its actually just a bypass section on the oem oil filters. I have done oil analysis on my '99 E300, and after 5700 miles on Amsoil series 3000, my soot level was less than 1%.
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  #13  
Old 03-31-2002, 05:30 PM
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LightMan, I have never had any oil checked by a lab... how does that work in terms of YOU... do you run the oil , lets say, 3/4 ths of the distance you think it should last,,, and send in the sample ? or half the distance...? If you wait the full distance... and if it checks out still "good" whatever criteria you choose for that....do you keep driving it and send in another test sample ?

Seems to me that $ 14 would go a long way towards just changing out the oil.... always the safe bet... ?? particularly if it might include two checks on one batch... Enlighten me LightMan.. Thanks, Greg
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  #14  
Old 03-31-2002, 05:46 PM
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Oil analysis

its a great way to compare oils and how they work in your engine. Do the same change interval, and inspect the levels of soot, and crucial wear metals. What you do is order the kit, and then when you drain your oil at your normal interval, collect the sample in the provided container(using correct collection methods in the instructions), and mail it off. They will mail and fax your results within a few days usually. If there's a big problem, they'll call.

I did my testing with Oil analyzers inc, www.oaitesting.com
I bought my kits from www.amsoil.com along with the series 3000 HDD oil(5w-30, but a hair away from being rated 40). This is the utmost choice in cooler temp locations, I use it here in cleveland, and when i spend my summers in florida, i switch to the mobil delvac1 5w-40. I also bought the hand pump and extra line, so you can just draw your sample out from the dipstick tube.

another place to do oil analysis would be
www.avlube.com
www.oilguard.com

For 14 bucks, its worth it to me. Its kinda like getting your cholesterol checked, dont necessarily HAVE to, but its nice to know whats going on in your engine. go for it, and please post your results!
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  #15  
Old 03-31-2002, 08:03 PM
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OK,, so you use the oil the length of time your going to... and then check the old oil your taking out... Do your results cause you to shorten the length of time you keep the next batch of oil in your car ? What if you just figured out how much earlier you could change your oil if you saved the $14 and applied it to your new oil purchase... ? This seems more like checking the cholesterol on something which has been removed from your body which you are not going to put back in.. and not much help with respect to the new organ you have... LOL...Greg
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