Re: Simple test for oil quality on bushing engines

[equad99]

i have not had great luck using tcw-3 oil in motors that call for 40 weight. particularly johnson model a and k rotary valve motors, and older piston port motors.the rotary valves and piston ports just dont seem to seal up with the lighter oil. poor low speed, and being a cantankerous !!!@#$^&(*!!! to start. they also seemed to run hotter. i have had good luck using amsoil sabre in these motors at 16-1 ratio.im not sure of the exact weight of the sabre, but its a lot more robust than the tcw-3. i have not experimented with leaner ratios, aeroshell w-80 (40 wt ) ashless dispersant oil works well but is not as clean as the amsoil. if you try it get the red label not the blue label. the non dispersant type blue label type forms a lot of deposits. they have engineered newer motors to run on lighter oil and a lot less of it, but i have found that the older ones still require the same weight and mix that they did 50 plus years ago, and newer and better oils do not make up for this. for older motors that call for 30 weight, tcw-3 oil has been great for me,mixed at the engine manufacturers recommended ratios. it was made to replace 30 wt oil. art b