The low oil-content recommendation applies to the "big block" Tigres, i.e. the ST-2000, 2500, 3000, 3250, 4500 and 6000, but not the 2300. I do not know why this is so, but I guess it has something to do with power output in relation to conrod bearing size etcetera.

In all cases break-in should be made with "normal" oil content fuel. My experience is that the break in procedure takes quite a long time, i.e, at least a couple of hours running time, but once that is done the engines never seem to wear out. I have an old ST-3000 that has been run for more than 200 hours by now and I have yet to replace any parts, not even the ball bearings. I am using no-nitro fuel with 10-12% Graupner/Fuchs Aerosave synthetic oil (no castor) for this engine. The good thing is that the fuel is quite inexpensive and leaves practically no residue on the aircraft.