Actually - all of what I wrote comes purely from personal experience (about 100K miles of it on M51 and 300tdi engines). The nitrile rubber part has been tested on the seals between my fluid-fluid heat exchanger and the filter head. First time I fitted a seal I made myself there (the standard seal didn't fit right onto the P38 filter head) started sucking in air after a week or so, and while I was taking it out it came apart in a number of pieces, and there were small rubbery bits all over the place inside.
In distinct contrast, viton seals that I switched to using after that do not exhibit the same deterioration. They shrink slightly and harden, but they don't disintegrate.
You are mixing with petrol, I am talking about mixing with diesel. Petrol is considerably better as a thinning agent, but can also cause issues with injectors gumming up faster and the fuel pump will wear out somewhat quicker, too, because it relies in lubrication properties of diesel to reduce wear. Vegetable oil has different lubrication properties, and petrol will make the problem worse. You might still get tens of thousands of miles out of it, but it'll be less than you would if you were purely mixing with diesel.
Heavy soot won't get through the 0.5 micron filter. Water will settle out, same as it does from vegetable oil, along with all the other crap. Unlike with vegetable oil, it'll still be black, though, so you can't easily tell where the crud at the bottom ends and the usable stuff begins in the settling tank.
In distinct contrast, viton seals that I switched to using after that do not exhibit the same deterioration. They shrink slightly and harden, but they don't disintegrate.
You are mixing with petrol, I am talking about mixing with diesel. Petrol is considerably better as a thinning agent, but can also cause issues with injectors gumming up faster and the fuel pump will wear out somewhat quicker, too, because it relies in lubrication properties of diesel to reduce wear. Vegetable oil has different lubrication properties, and petrol will make the problem worse. You might still get tens of thousands of miles out of it, but it'll be less than you would if you were purely mixing with diesel.
Heavy soot won't get through the 0.5 micron filter. Water will settle out, same as it does from vegetable oil, along with all the other crap. Unlike with vegetable oil, it'll still be black, though, so you can't easily tell where the crud at the bottom ends and the usable stuff begins in the settling tank.
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