can I mix peanut oil directly withy diesel and run that??

 

Rudolf did.

 

Can't get a better OK than that.

 

what ratio works?

I would assume this would add lubricity as well thus replacing PS/MMO

 

I would tread lightly and do my homework when contemplating mixing any non-petroleum based fuel (vegetable oil) in a HPCR 3rd Gen engine.

The elements I would be most concerned with would be viscosity and rail pressure. If your fuel mixture viscosity were too high and you hit max rail pressure I would think that you could potentially crack or blow off an injector tip. Most people running veggie based oils heat it to obtain the correct viscosity when running 100% veggie oil. However with that said, if you cut it to the right proportion, whatever that is, with diesel and were on a road trip on a warm day and burned the entire tank and then refilled with diesel to purge the lines and filter before shutdown I would think you could get by with it. I would also be concerned with potential filter plugging if it sat in your fuel distribution system over night and the temps dipped enough to cloud it. Pure peanut oil may be more refined but remember what a jar of peanut butter with that layer of peanut oil on top looked like when you put it in the refrigerator overnight? The viscosity on a cool morning start up could pose a serious dilemma if too high a concentration peanut oil is used.

Most people burning straight veggie oils seem to use a heated system and/or a two tank system to switch to pure veggie oil after the engine is started on pure diesel and the engine and fuel system reaches operating temp and then they switch back and shut down on pure diesel fuel to purge the lines/filter of any veggie oil.

Remember...Rudolph Diesel was not running an electronically controlled HPCR injector system.

Anway just my 2 cents. If you do decide to run it let us know the results and what proportion you run.

 

I dumped a 5 gal container that someone gave me right in my tank before i topped off. No problems and you could really smell the oil in the exhaust more so on the cummins than other cars i have done it on. That was my first time with Veg in this truck. I'm going to put 7 gals in with the next fill up. I was up to 50% on my rabbit pickup however once the weather hit 50F it was very hard to start with that mix. I also have a 1993 CTD and I think its a little more forgiving to different fuels. Some people go as high as 80% veg. Myself i would slowly increase the % until I found a happy % for my truck or car. If you do it smart you can save some money over time. My buddy on the other hand went right to 80% in his Benz.