Originally Posted by Putty
Oil no problem, no need to drain as looks fine and OB is only had about 10 hours use from new 2 years ago, brought locally from a chap and engine looks spotless. Thought I would replace the gear oil but cannot undo the screws. So I am thinking in 10 or so hours of use the levels should be ok as i am dying to get out on sunday, should it be OK?
If possible change 2 year, 10 hour used old gear oil, new engines requires firts oil change after first 10 hours engine use, remove both oil screws, sometimes you'll find very small/fine amounts of metal fillings/particles in the exiting old oil, this is normal first 10 hours gear wear, after draining completely used oil, pump some new oil on upper oil screw while rotating the propeller with hand, so to wash complete gear case interior, when oil has finished exiting lower screw, replace for a good quality gear oil 80-90 grade or a multigrade 80/90. This is a factory recommendation, but up to you if you would like to go change it or not, oil is cheap, first screw removal, the hard issue.
Yes, it's always very difficult in any brand engine to remove first time leg oil screws from brand new, get a big, thick, large screwdriver to fit properly the screw upper cut/notch to screwdriver, or use a impact driver as Nos recommends, if none available, take engine to shop to have screws loose with appropriate tools, practice oil change by yourself. Engine must be in a vertical position for correct draining oil out and topping new oil level in.