ZebraOne,

If I understand your question you are asking about the oil to be used in your Fuji, I am not familiar with that particular engine but it should be ok IF the oil is meant to be mixed with the fuel you are using and Klotz MC 2 is good oil, in other words some oils that are made for gasoline are not mixable with alcohol based fuel. and some oils made to be used in alcohol based fuel are not recommended for gasoline.

One of the ways to determine how well a specific oil is doing in protecting and lubricating an engine is to check for piston ring sticking, this is specially true on engines that are run hard, some oils will form lots of deposits under high temps. that can really goo up an engine and cause the rings to stick. The other thing that is usually checked by engine people is cylinder and piston wear/scuffing, if the oil is not doing the job one of the first things that will be noticed is premature piston wear specially on the "thrust" side of the bore or on the exhaust side of the piston.

A real tough test of oil is to take a new engine that has never been run and run it under full load at max horsepower with no break-in and see if it lives with out piston/cylinder damage, some engine manufacturers use this method to help determine which oils to recommend for their particular engine, it is a real tough test.

New engines that have not been run like DA, 3W, ZdZ, Taurus etc. should ALWAYS be run Slightly rich with some added oil for the first few gallons, it is cheap insurance that your engine will have a long happy life. I would also recommend that the first few flights 3 to 5 or so should be made with very little time spent at full throttle, this gives the rings a chance to start seating before they have to handle the high heat load of extended full throttle, you most certainly will NOT hurt the engine doing this even though sometimes one hears that you should run the engine hard right from the beginning.

After break-in I have had very good results using Amsoil 100 to 1 mixed at 90 to 100 to 1, there are other oils out there that are very good also but I personally like Amsoil 100 to 1 and for break-in I like Pennzoil 2 stroke air cooled oil. I run my engines a little longer on petroleum based oil before switching to synthetic than many engine manufacturers recommend, I find this helps the rings fully seat before switching to synthetic oil which does slow the engine wear process and of course would slow the complete ring seating process.

A word about engine deposits which we try to avoid, they are more likely to form in engines that are not adaquately cooled so if you are seeing excess deposits or early ring sticking then maybe you need some baffling for improved air flow around the cylinders in your plane.

Klotz, Redline, Honda and Stihl amoung others are good oils too.

flierbk