Got 70 hrs on my 225HO. I changed the lower unit oil even though they say 300 hours. Used oil looked good and had no smell like the old oils. used to. I think this is synthitic oil so I do not know how to judge it.
The motor sets up to 3 weeks at a time without being ran. Starts good, idles good, and has the standard(?) rough place around 2000 rpm. Do you think i Should change the plugs. I do not want to pull one and look because might not be able to index correctly after being used. I have run XD100 oil all 70 hours.