Well... what it does... that many many people can not get through their heads... is that more OIL... makes the gas to air ratio LEANER. (because there is less GAS to go with the existing air)... the space that would be occupied by more gas is now occupied by more oil.
Like that guy above with the pinging.. he is running 4 oz of synthetic oil per gallon.
Synthetic provides about as much lubrication as you can get.
So in my opinion... he should cut back to 2.5 or 3 oz of oil per gallon of gas.
His pinging MIGHT go away... but it is a little odd that his pinging is ocurring in the mid-range (from the description).
I knew the 'too much oil" argument years and years ago... but I didn't know that some manufacturers actually made warnings about it..
I had an argument here with some kid who said the claims I was making sounded like "the kooky claims made on some late night wacky miracle motor oil commercial".... heheheh... not quite !!
Now.... you can compensate for the 'more oil leaning out the mixture' by running richer jetting (which is EXACTLY what full race engines do)... but that runs towards more problems with plug fouling and a lotta smoke (AND POLLUTION.... HOOOWEEEE !!!)..... : )