2 cycle engine oil
 

advance auto parts has the pennzoil brand on sale. anyone adding this to diesel fuel to at least, in the hypothetical sense, make up for any lack of lubricity possibly inherent in the new ulsd formulation? thank you.

An oil thread and a ULSD thread all in one! Score!

The new ULSD fuel will not hurt these engines/injection pumps. Adding of lubricant is not needed and would be a waste of $$.

insurance. as, just in case? any down side?

ULSD has been in use for years in the UK. No issues with it whatsoever.

'euro' diesel fuel is a far cry from u.s. diesel, both in terms of cetane level and overall level of refinement.

I'm no conspiracy theorist, but taking for granted that big oil is acting in your best interest, or that they will get the lubricity (et al) right the first time or second time is IMHO... unwise.


I've run 2 cycle oil thru my engine @ approx 80-100:1, no issues. But I prefer power service.

Less money in your wallet for nothing.

2 cycle - lawn mowers, chain saws, weed trimmers, mopeds, ...

4 cycle - vehicles, Mercedes-Benz, ...

Jim W.

2 Strokes =1 cycle
4 strokes =1 cycle
just a pet peeve

Same for me with engine/motor.

The 123 injection pumps do indeed need help in the lubricity department if using ULSD. The injection systems beginning in the nineties had hardened barrels which will hold up fine with ULSD. That said, there is NO reason WHATSOEVER to make that additive 2 cycle oil. I have absolutely no clue where that came from.

Go buy the cheapest engine oil you can find and put in about 8 ounces or so every time you fill the tank. You don't need ATF, and you don't need 2 cycle oil, you need the cheapest clean engine oil you can find.

Have a great day,

2 cycle oil is designed to be burned in the combustion chamber without fouling plugs or leaving carbon deposits, while "engine oil" is designed to remain in the crankcase. 2 cycle oil will leave much less in the way of deposits & reduce the amount of coking that may occur, if you feel you must burn some sort of oil.

Larry, that was good information of the type that is a little scarce. The pump maker had to know there was a problem or going to be one. Otherwise they would not have increased costs by adding the treatment to the pump cylinders.
Eight ounces of cheap new oil added to each fillup is certainly not a hardship either on our old diesels. Pump seals may even last better. Who knows? Has the new fuel been changed at the molecular level?
I know little of chemistry.Those injection pumps developing leaking delivery valves seals are giving a pretty clear message. Plastics are even made from oil so USLD might be a real exotic product to start with. The old fuel had enough of a real oil component left in refining to keep those seals swelled. Or did not disturb and shrink them.
It's like the guy that runs his really older mercedes gas engine at about 90 mph with original soft valve seats on unleaded gas long distances. We all know there will be no trouble acording to the oil companies. I think his valve seats will recess much faster than normal into the head anyways.
.He might partially or totally avoid it by adding a lead type replacement additive. But probably will not do it. Just my thoughts.
One thing for certain is if there are problems the oil company is not going to come good for them. You will be on the hook. I do not feel the sky is falling either. I will just let others be the test vehicles for a year or so. Much more will be known by then. If nothing develops with a lot of cars I might stop. I will be adding the eight ounces of oil per fill up till then. Might cost me ten dollars over that year and it will do no harm. I think the ratio of dillution is pretty high. We are talking one cupful to a tankful.

Since diesel engines have no spark plugs to foul and they are designed to burn oil in the first place with the by product of combustion being oily soot rather than carbon, please explain why 2 cycle oil is necessary.

I didn't say it was necessary, I said it was a better choice "if you feel you must burn some sort of oil". Was the diesel engine designed to burn the additives in modern crankcase oil? Are modern crankcase oils designed to be burned as fuel as 2 cycle oil is?