Sorry for the nube question. My 1st desiel. What does making oil mean and how do you check or find out?

Thanks

 

never apologize.. we were all nubes once!

for the 08-10 models the emissions system captures diesel soot in the DPF (diesel particulate filter). When the filter is detected as full, the system injects some raw fuel thru the engine injectors on the exhaust stroke to cause the filter to burn up the accumulated soot.

some of this fuel gets past the cylinder rings, and ends up in the crankcase along with the oil. thus the volume of 'oil' increases. aka making oil ..

you can check it using the documented 'short stick' method. https://www.ford-trucks.com/forums/8...ml#post7189293
pull the oil dipstick out, clean it, and re-insert, but let the cap rest against the tube, instead of seating it back all the way..

pull out and check.. if OVER full there is a problem..

my truck makes oil. I have it tested (see Blackstone Labs).. this last time I was at 1% fuel in my oil. before that 2.5%.. (they recommend <2%)

sam

 

I have never had this happen! (that I could tell) 90,000 miles very little in town. I change oil every 3,500 miles! Old school (oil is cheaper than iron)

 

some folks notice cause they put in 15qts of oil and get 18 back out..
and some never create any

Sam

 

my truck makes oil. I have it tested (see Blackstone Labs).. this last time I was at 1% fuel in my oil. before that 2.5%.. (they recommend <2%)

sam You got .375 quarts of fuel in oil in what mile oil change?
Last oil change you got .15 quarts fuel in oil! (miles)
If they get 18 back out of 15 thats 20% (miles)

 

both 5,000 mile changes..

2nd was 4000 miles towing 7,000lbs.

I didn't say it was a lot, just that it does..

Sam

 

This subject "making oil" has been on my mind for several weeks now. First of all. why would more blow by occur on an exhaust stroke than on the compression stroke? In fact why would any blow by occur on the exhaust stroke, aren't the exhaust valves open, or am I missing something? But what troubles me most is the dip stick. I've been checking oil since 1957 and this is the first dip stick that I can't read. I had the oil and filter changed yesterday under my very close supervision. The boy put exactly 15qts of oil in, he started the truck and drove it out the shop door. I drove it about 100 yards and parked it to check the oil. Did checks both ways and could not swear to what I had. That crappy little dip stick is very difficult to read. It seemed to me that the level was the same as it was just before the change which is slightly above the full level using short stick, but I couldn't say for sure. At times there is oil a quater inch up the wire, then on recheck it's a quarter inch up the wire on one side of the wire and just above the full level on the other side of the wire, whats up with that? The oil can't be that high or the wire would be covered all the way around, right. Oh well, I kept samples from the last two changes and when I get home I'll send them in and see what I had. Until then I guess I'll just keep on truckin.

 

This is a widely discussed topic, we all know it is not normal and we all know we would like to kick that engineer in the butt for the bad dipstick.

The regen will make oil I think for a couple of reasons.

First one is (and l'll get shot for this one) most don't know how to properly break in a diesel to seat the rings. You have to do the intial break in and then you have to run it hard and long. Best way is tow the heavist thing you have up the steeps grade you can find. At 600 miles I towed over 10K for 600 miles.

Secondly the regen will tend to make oil because of low rpm's, even though it is on the exhaust stroke I think there is not enough force to push it all out the exhaust as intended.

So what can you do? Try tow/haul in town to keep the rpms up.

BTW I don't make oil...my last sample towing accross country for around 4K miles showed <.5. That was higher then normal but I must have had around 30 or so regens.

 

Agree with Senix, I do not make oil either. I have it tested, less than .5% and I tow, city driving, empty, and idle etc. What I am seeing here is, "what can we believe." If Ford says no more than 2.5% in our oil then that equates to 3/8's of a quart out of 15 quarts. Is there something else going on here? I do not doubt our people here of the forums, but I have suspect that you may have other issues. I don't know about you guys but from the old days, a crankcase with 20% diesel fuel was almost death within just a few hours. I know we used to put a quart of diesel in a gas engine, run it for 5 minutes and then drain, that supposedly cleaned the engine. But if these later diesel engines are so picky on what we burn, and run in them and need to change oil, filters and etc, then if you have diesel in your crankcase be a big signal to make sure you have that checked and or rectified?

 

I don't know if Ford is saying >2% is bad, but Blackstone does..

Sam

 

It is bad..too much can lead to a runaway, plus the added lack of lubrication on the bearings.

 

International tells us that 10% fuel dilution or less is ok on their DPF engines.

 

pretty interesting.. 1.5 qts or less in 15..

Sam

 

I'm new to diesels also. I've read a few posts on this topic and wasn't sure what everyone was talking about. Glad to know someone stepped up and asked the question.

I've always wondered why my oil looked to have a very low viscosity almost "runny" like water, and smelled like diesel fuel. I now know.

Guess i probably should change my oil a little more fequently.

 

Other than checking the oil, if you do your own oil changes you can measure what you get out for a quick check.

Only real way though is going to be an oa.

I use the jugs I buy fresh oil in to put the old stuff in. I always get around 14.8 back out.