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Old 12-04-2016, 09:13 AM   #1
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Buying a used diesel RV that requires ULSD

Recently read a post from someone who I believe frequents Mexico and says he has no problems using regular diesel fuel in his ULSD require motorhome.

I am no mechanic. I do not know if this is wise or not.

What I do know is I would hate to buy a used ULSD RV that traveled Mexico using regular diesel fuel AND this tidbit was not disclosed to me.

I guess what I am saying to buyers ask the seller if the motorhome has traveled Mexico. I think that some border towns you may be able to find ULSD but most of Mexico does not sell this.
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Old 12-04-2016, 09:58 AM   #2
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good question for sure.you realize the mexico diesel will not harm the engine ? its hard/harmfull on the DEF system and over time may plug up the exhaust filter (very expensive) although the def additive is designed to clean such.I would be most worried if it was a engine between 2007 and 2009 where the regen system was in place and no def system
IF one were to add the expensive LUCAS oil fuel additive it may surfice in such cases(travel in mexico)
just my thoughts others may vary
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Old 12-09-2016, 11:16 AM   #3
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The only engines that need ULSD are the ones with a DPF (diesel particulate filter). All US diesel vehicles by law, must use ULSD. But, it will not hurt an engine without a DPF to use high sulfur fuel.
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Old 12-09-2016, 11:21 AM   #4
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DEF does not clean the DPF. Two separate systems. DPF is a soot trap that when in the cleaning process uses dsl fuel to cook the soot. DEF is injected in ex to lower Nox emissions.
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