Hasve a tecumseh 3.5hp h35-45484m. changing the oil for the first time since i got it & cant find the oil capacity from a google search. I see other 3.5hp that take 21oz, is this correct or close enough? Also, Im using 10w-30 conventional, will this cause any problems? I plan to change the oil often just because its conventional & i dont ride this particular bike hard by any means. thanks guys