Then use that bottle of seafoam run it in everything if it makes you happy. I am yet to see ANY auto maker recomend it. As I recall a few years back GM had a bulletin on the use of engine flushing products (DON'T DO IT). The reason for this was that they found it did more harm than good. How you may ask, bearing oil clearance is very important and pretty tight now days. These engine flush products can actually "strip" the bearings of this thin film of oil, were as the detergents in your engine oil DO NOT. If it makes you happy go for it, as a Master Tech you will not convince me it is needed. The majority of my knowlege is in diesel engines, our engine oils have to do a little more work than that of a gas engine. I have learned more about engine oils than I ever thought I would need to know and they keep changing to adapt to modern engines needs. One last thing please tell me more about your hight injections pressures, (CRD) Common Rail Diesel engines are on average running a system around 26,000-30,000 psi. I may know a thing or two about high pressure injection systems. Even the modern Gas DI engines are still low compared to diesel injection. I'm sure those DI gas injectors are as complex as piezo injectors, that can inject 5-6 times on one cycle per cylinder. One large injection JUST BEFORE TDC then 4-5 micro injections as the piston is going down on its power stroke. Your injection systems most likey came from our diesel systems...diesel have been DI for a long time.Sorry, but I have a different view. Your first sentence seems to contradict your opinion. Some "detergents and other cleaners" are ok in oil but not this concentrated one? My experience with Mercury Marine two cycle high pressure DI motors is that it eliminates carbon build up. Granted two cycles burn oil in the combustion chamber but that only strengthens the case. Four cycle motors also burn oil although at a much lower rate when healthy. As to fuel system problems again, modern DI marine motors pressurize fuel to very high pressures and have very complex dual stage pumps/injectors. Long term use of this product has proven harmless to those systems to the best of my knowledge. So while I would agree that someone who has owned their vehicle since new, only put the best oils and fuel in their vehicle, and always perfectly maintained their vehice may have little need. Carbon build up and other deposites do occur. They do have negative effects. And, this product has proven itself to me to remove them.