Two stroke oil in diesel - Page 2 - Fuelly Forums

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Old 12-19-2012, 01:56 AM   #11
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People do this in order to add lubricity to modern diesel fuels. Diesel pumps and seals are lubed by sulfur and with ULSD, its wearing seals and pumps out. Adding a diesel additive lowers wear.
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Old 12-27-2012, 08:17 AM   #12
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Much disinformation in this thread.
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Old 12-28-2012, 05:59 PM   #13
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Rather than simply saying 'there is disinformation in the thread', why not actually identify which piece(s) of info you are concerned about, rather than leaving everyone to guess blindly?
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Old 12-29-2012, 04:42 AM   #14
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Read loads about this over the summer. On balance seems it isn't worth it.
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Old 12-29-2012, 11:02 AM   #15
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I work on heavy equipment with mostly cummins and cat engines. About 10 years ago caterpillar did a bunch of testing on ultra low sulfur fuel. Their results were the ulsf has no effect on the wear on their fuel systems and it was ok to use on all cat diesels
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Old 01-09-2013, 08:52 AM   #16
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bluehudgo,,

do they use the same type of fuel system on the heavy stuff as used in regular pickup like the dodge with Cummings engine..??

I have been reading a bunch of stuff on cummings forums about fuel pumps crapping out due to not enough lubrication in the ULSF being used now.
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Old 01-27-2013, 09:20 PM   #17
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To the OP: If your engine has a DPF then do not add 2-stroke oil as it will foul it up.

ULSD (Both Euro and US) is additized with lubricity enhancers to make up for the lubricity components which were removed along with the sulphur. Currently the max wear scar rating on US ULSD is 520um and Euro ULSD is ~460um(IIRC). Lower is better.

Diesel common rail manufacturers add coatings to the internals of their HPFP pumps when they're going to be fitted to vehicles which use diesel that has a little lower lubricity. US for example.

As for additives there is a plethora of products out there, but IMO nothing works better than biodiesel @ 2% (B2) for lubricity. It's just enough to be more than adequate and not so much that it'll cause problems if it's not up to par in terms of quality.

The reality is that the majority of diesel fuel sold in the US is well within spec and even close to Euro spec when it comes to lubricity. Now it's clear that the newer VW TDi's with their Bosch 4.0 common rail system have been having problems but from what I've read the issue is mis-fueling (gas) and/or the decision to use aluminium instead of steel for housing of the HPFP.
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