Motor oil as diesel fuel lubricant - a different take on the subject

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Hi all!

It's well known that fuel dilution shortens the life of an oil, and compromises its ability to lubricate.

Knowing this, is it the case that those who are adding oil to their fuel in an effort to lube their injectors and fuel pumps are fooling themselves?

Anytime I see the subject brought up, the only thing the proponents can point to as a "reason for" using it that the engine is quieter, and that it hasn't blown up yet. oh, and it's cheap..that's probably the biggest attraction.

Among the "reasons against", I would say are the deposits left upon combustion, compromised cetane / btu, and increased HC / PM emissions..

but the fuel dilution thing is something I never hear discussed. anyone have any input?

1/25/096:00 AM

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Original Post

dad2leiaMember

Well, I've used a variety of 2-cycle oils in the tank of my Dodge Ram with Cummins, with mixed results.

It did quiet the engine a slight amount (not that the 2001 version is quiet by ANY means. My dog knows I home from halfway up my street!) . Mileage improved slightly. Nothing else really noticeable happened.

I guess the biggest reason I tried it was to try it, and see if it did anything. I used a pretty hefty dose, then subsequent lighter doses. Started at 1 full quart of lube per 35 gallons (works out to about 150:1 ratio). Then 1/2 quart per, then eventually a cup per tankful. Really crude data said that it didn't matter what ratio, but adding SOMETHING seemed to help.

I know, very scientific, but at least it is an experience that you can read about.

1/27/097:59 PM

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