Didn't mean to ruffle any feathers but my experience with Notoil has not been positive. Nor has mine. For one thing, I was not at all impressed by the amount of work needed to gfet the filters clean using either their special cleaner, or Oxy-Clean. For another, the oil looses its tack way too fast. I oil 3-4 elements at a time, hang them out to drain off any excess and let the oil "dry", then bag them up for later use. The No Toil looses its tacky feel in just a few days, whereas FFT stays sticky indefinitely. To be fair, I hear it's improved since then, but I have on need to change what works. The best way to clean the filters is to get a 5 gal bucket with a lid. Fill it with 4 gals of diesel. Buy some rubber gloves and wash the filter in the bucket of diesel, then wash the filter with some dish or laundry soap, rinse and let dry. The bucket of diesel will last a very long time. All the bad stuff sinks to the bottom.This is my method, except that I use mineral spirits and skip the soap and water. MS is much less oily than Diesel. NEVER...NEVER...NEVER...use diesel or gas to clean your filter. ... Using gas or diesel will shorten the life of your foam filter. Gas should not be used to clean filters (or anything else) because... It's very toxic. The vapors are very toxic. It's RIDICULOUSLY flammable. Its effect on filter longevity is highly questionable. The filter is, after all, part of the fuel system. But Diesel? Not so much, although Diesel is absorbed through the skin, and has a cumulative toxic effect that can lead to kidney failure. It doesn't take a ton of fft to get good coverage on the filter. I usually pop a small hole in the foil that covers the opening on the fft bottle and drizzle the fft all over the filter before gently squeezing it into the filter surface. Foam (or gauze) filters don't filter anything smaller than a very large grain of coarse sand. The oil is what catches the dirt. The element must be thoroughly oiled clear through the entire cross section of the media, or it can't reach its potential. Oil it, work the oil clear through, squeeze off the excess that you can, then hang it to drain any further excess and allow the vehicle solvents to evaporate.