It super cleans the oil and takes out almost all of the black soot that accumulates in it from the exhaust. The soot supposedly causes wear issues over time andsupposedly the egr stays cleaner as well. Some people put it on just to extend the oil changes to longer periods. I still plan to do my oil changes by mileage. Yeah it costs a bit more but the trucks are expensive and unless you plan to trade and not keep it for a long time, it is a good idea. I doubt i will ever again buy a new truck. The oil catch can is a good idea as well for taking oil and water vapor out of the system. It keeps oil and mists of oil and water from going thru the turbo and into the intake and egr. It is a bit of an investment but i didnt discover any of this until after i had owned the truck for over 3 years.. Fortunately its not to late as i only have 15k miles on it. I have found only one dedicated oil bypass kit on t he market. It costs over $500. I dont really like it as it uses the toilet paper type filter. It may be fine i just dont like that type.. The colorado oil filter doesnt accept the traditional adaptor for the system and a T fitting is required at the oil pressure sending unit to get the oil input to the bypass. I am having trouble finding the t fitting as its mostly metric. I tried Mcmaster-Carr as was suggested to me but they said they didnt have what I asked for. I will purchase a base kit from another diesel truck and adapt it to fit which should work as most of the parts are the same. Its mostly the length of the two hoses and the mounting bracket that i may need to modify. Unless the filler cap from the base kit will fit the chevy i may have to drill the stock filler cap and tap the threads in for the elbo. I dont know how fast it cleans the oil but it doesnt take to long and it filters out most of that soot. When i started changing my own oil i was amazed how fast it turned black from the soot. Almost immiediately. I would buy the ready made kit but i dont like the filter and if i do it myself i probly will save about $200 or so. thats about the cost of 3 or 4 oil changes. I use the best full synthetic oil i can find, which is about $16-$22 a gallon. The stock type filter is about $14. The dealer charged about $80 to do an oil change but i dont know what oil they use. He is about 45 miles from me so i decided to do it myself. My truck doesnt use any oil at all and has no issues so i'd like to keep it that way as long as possible.