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I'm gonna fill my crankcase with diesel today

1K views 6 replies 6 participants last post by  pcordes1979 
#1 ·
I've been wanting to try this for a while now, and I need to change my milky oil from the headgasket that I thought was a valveseat. I don't want to throw away $50+ to do two oil changes today, and diesel is hydroscopic. My plan is to pick up 5 quarts 5w-30, 5 quarts of rotella on sale for $11, and two gallons of diesel. My "planned" oil changes are as follows:

#1: new filter, 3 quarts diesel and 1.5 quart of 15-40 rotella, idle till warm. *I may substitute "blue bottle" stp oil stabilizer instead of rotella.
#2: new filter, 1 quart diesel, 3.5 quarts rotella. Maybe do some errands with the escort?
#3: new filter? Fresh oil? Do you think change #2 is even necessary?

Am I a WHOLE fool for doing this? This engine doesn't have a sludge problem to my knowledge, but I haven't dropped the pan, the head was pristine. I just don't want to waste $50 for oil that will be in my waste barrel in an hour. I honestly don't expect to hear a knock or anything. I'm predicting that the first diesel fill ought to get nearly everything out. Whatcha guys think?
 
#3 ·
Its a quart overfull!?? That kinda blew my mind, being that the headgasket failed away from oil passages. I ended up wearing pajamas all day and drinking coffee, no progress.

I bet I could just crank it over with diesel and be okay, but there are some sticking lifters in there! I think the second "flush" will be drawn out for a 15 mile drive.
 
#4 ·
When I start up any engine the first time after a rebuild, head gasket change or any time I think something other than oil is in the pan. I buy the lowest cost oil I can find. Drain out all the old, install the cheap oil, drive 10 miles and then drain. Refill with good quality oil and a new filter. Then after 500 miles change the oil and filter again.
 
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#6 ·
When I change really dirty oil in a vehicle I do more or less the same thing.
With the engine warm, I drain the old filthy stuff out, then add two quarts of diesel fuel. I then run the engine for ten or twenty seconds and shut it down. As I putter around on other things on the car, I repeat the process every few minutes until I've done it half a dozen times. Then I drain off the mixture.

I don't think it harms the engine as there is still oil in the filter and trapped in the engine to add lubricity to the fuel oil. In my young and foolish days I did this treatment and drove the car a few miles up to highway speeds. The next year I had the oil pan off and inspected the bearings, they were fine.

In extreme cases the diesel/oil mix is still very dark, and I repeat the process, but only run for a few seconds at a time. So far so good.

I don't think diesel has much cleaning powers other than simply washing away the dirty oil itself, so I don't think it will remove deposits in the engine. I have tried using it as a parts cleaner years ago and discovered it's pretty ineffective.

I also have an oil furnace so all this waste is used to fuel it.
 
#7 · (Edited)
When the cylinder head chambers on 2 cylinders cracked on my old 93 2.2L 4 cyl Cavalier and after a water ingestion event on my 93 SOHC Escort all I did was change the oil and filter, run the car for a while to help boil off remaining water in the system, and changed the oil and filter again.

I ran conventional oil in the Cavalier and Motorcraft semi-synth in the Escort at the proper grade for both and had no issues with moisture removal. Never had any issues after that and both cases the oil was quite milky initially. So with that said Pizzaman5000, what you are planning on doing may be overkill, and I generally disagree with using engine oil additives as who knows what you are exactly getting for them for any number of reasons (plus if they really did as they advertise then vehicle manufacturers and oil producers would be recommending to use them all the time).
 
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