Hi guys, I've just drain the oil from my '84 Katana and are putting oil back in. I am following the manual for the GSX750E/ES which I would assume would have the same engine as they ran from 1983-88. In the manual it says to put in "3.7 L" which I'm assuming to be 3.7 Litres, it says to put in 10W/40 however says that 20W/50 is also ok, so that's what i put in. Question is...I put in 3.7litres and watched the oil widow at the bottom of the engine, but it is only just at the bottom of the widow, not between the two points as suggested in the book. Do I put in more oil as this will take it over the recommended volume of oil or do i just leave it at 3.7litres? I haven't taken the bike for a ride yet either, so with this be the reason why it hasn't showed up between the two markers?