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Old 12-06-2018, 10:02 AM   #1
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2000 Cummings ISM 450 on B20

I've read through he forum and seen many post of 2002-2001 and up are fine with b20. Great, I just bought a 2000.

Does anybody have experience on running B20 on the earlier ISM engines?

In Texas all I can find is B5, but it's getting harder and one day I will have no choice.

Any retro fit's, or additives that will keep the fuel from eating the engine?

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Old 12-06-2018, 10:04 AM   #2
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Earlier engines will tolerate anything and everything pretty much compared to the over engineered environmentally acceptable newer engines. I don't really understand what you are concerned about.

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Old 12-06-2018, 10:22 AM   #3
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Concerned that Cummings has not stated compatibility? Only engines past 02 are officially supported on B20. I'm concerned that the more corrosive Biodiesel might destroy rubber seals, copper, etc. in an engine that was not designed to run with it.

I would like to here from somebody with experience.

It would be nice to hear from somebody that is running a pre'02 engine without the EPA/DEF systems.

From Cummings:
What Cummins engines can be used with B20 biodiesel?
The current approved engine models are as follows:

On-Highway: ISX, ISM, ISL and ISB engines certified to EPA 02 and later emissions standards, ISL, and ISB engines certified to Euro 3.

Off-Highway: QSX, QSM, QSL, QSC, QSB6.7, QSB4.5 and QSB3.3 engines certified to Tier 3/Stage IIIA, QSM Marine, QSM G-Drive.

High Horsepower Off-Highway built after January 1, 2008: QSK78, QSK60, QSK50, K2000E, K50, QSK45, QSK38, K1500E, K38, QST30, QSK23, QSK19 and K19. Also Marine QSK60, QSK50, K50 QSK45, QSK38, K38 QSK19, K19.

Cummins has approved B20 for the high horsepower engines listed above with the following fuel systems: Pressure Timed, High-Pressure Injection, Modular Common Rail Fuel Injection System and BOSCH Pump-Line-Nozzle.
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Old 12-06-2018, 02:45 PM   #4
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My engine is older than the OP's and is not on the Cummins approved list.

ULSD was not available when it was built and it is a 100% mechanical engine.

C8.3 is the engine model.

I have filled with B20 and did not notice any ill effects.

B20 has more lubricity than standard ULSD.

When filling with ULSD I add the Cummins approved lubricity and cetane enhancer.
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Old 12-07-2018, 11:55 AM   #5
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Thanks FB, I think I just need some re-assurance. It intimidating being a new motor coach owner.
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Old 12-07-2018, 01:11 PM   #6
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Always prudent to ask when not sure on anything - I know I do, and always understand the input I receive is from the as mentioned experiences of other members, which may not still be condoned by a company that built the product.

I was glad to see the recommendation of adding Cetane to B20, I even add it to B5. And, if going into storage for any period of time, adding a stabilizer like JF Biobor could not hurt!

(Actually, since I use Optilube in each tank, even B5 and B20, I suppose I end up with some added Cetane in each tank. But I also add more Cetane for B5 & B20, due to the lower output of power from each of these.)

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Old 12-08-2018, 04:57 PM   #7
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Thanks Smitty. I think I will run cetane booster in the summmer and add an antigel if needed.. (Texas)

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