There was evident oil as soon as I took of the name ring in the front of the lens
Washed every part with alcohol, except the lenses and I just wiped the grease from the helicoid with a tissue, it was not dirty, it just had to much
Easier to work on as this has JIS screws vs the flat screws of the 55 f1.2
Most of the lens is plastic, vs the 55 f1.2 where everything is metal