This is one of "Those" questions..Democrat, Republican,, Saved, unsaved do you eat meat,, etc..So..Instead 0f saying YES or NO, I'm gonna speak like a Politician and saw, "Maybe".. this is MY opinion, others have a right to theirs..FIRST..at 74 years old I don't just try stuff without lots of experimenting..this is exactly what I do..My diesel tractor uses a VERY good oil and when I drain it that oil goes into a clean sealed container to be stored in the barn for a while..I've found that any dirt will settle on the bottom. I've strained this oil during testing and found that IF the oil sits in the barn out of sun light for several months I can slowly pour off the top part of the oil and It will be clean..The gunk on the bottom has another more private use..I've gone as far as mixing sand, water, and other junk into some oil and letting it settle out for a couple of months and running that dirty oil through a strainer and in my test it was clean..I used a very good filter that was so fine it took hours to drip through..I felt of the oil and tested it for any contaminants. I found NONE...BUT,, I did NOT stop there..STP was added to the used oil to create a better tackiness and a slicker feel..in fact after wiping the oil off my hands with a clean cloth my fingers were still slick like when you get silicon on them..I made a viscosity guage and compared my motor oil with STP to cheap Bar and Chain oil from TS. The stuff I created was better IMHO..So,, I added water and mixed it with a mechanical device and turned my B&C oil light chocolate brown.. Testing showed it to be a lubricating oil but it was left to settle for two months to see IF the moisture would evaporate to the top.. It did not.. Then that oil was placed in a cheap electric saw and tested.. Slow moving chain and it actually worked well..the STP in it was still tacky and the fee;l was good.. So it was used in my big Echo 590 with the stock bar that came on the saw..( that's my crappy bar) and I bucked a tree with it.. The bar stayed withing heat and lubricating limits..I used that oil up and never again added water.. Because I had used oil on hand and don't want to bother with other ways of using it the Chain Saw is perfect..now all I do is let it sit.. pour off the good stuff, mix that in a clean container with STP (test and add as needed) and pour the bottom stuff into my "Other" use junk oil..Because here on my farm there seems to always be plenty of used oil some is aging while some is being used..The only thing I do buy is STP. The cheap blue bottle and to make a gallon of B&C oil less than half a bottle of STP so it's cheap.. WHEN a saw is running IF it's slinging oil or not oiling you can hear the chain making a metallic sound.. Well,, I danged sure can.. In fact after years you kinda just know..So,, go to the Church of your choice, vote like you wish and take my story on a believe it or not,, basics..I know what I'm going to do. I did my home work and it works for me. I found a easy way to check oil for grit...This is it. Use a CLEAN flat piece of glass like window glass.. Put a few drops of the test oil on that glass laying flat and level..Use another piece of clean flat glass and lay it over the oil sample. Move the pieces of glass around on each other.. IF there is any grit you will find it..hear it, feel it.. If the oil is good the two pieces of glass will want to stick together. When I treat my oil and test it so far mine has been excellent..Yes, I don't mind testing my creations and I feel good about using my B&C oil.I'm not selling this.. I'm not giving it away.. I've got nothing to loose if everyone thinks badly of me..I am satisfied with my results. I've made my choice........your choice belongs to you..Good luck..