If 90% of the use is cruise speed RPMs 3200-3800 then your oil covers you 100%. If you are very often quite a bit above that and with many WOTs then at high RPMs and temperatures it will leave residues and deposits inside the engine. I am in the first category with very few WOTs..So for the 10 x 4lt that I need for the season I pay 299€..With a premium labeled oil (you know which one) I would want exactly 800€.. Every mid-season I change 4 spark plugs x 3.5€ and I put one every 5 tanks and one Quickleen which cleans everything. In the last tank of the season I put double the amount for shock cleaning and we are fine.. So 14€ for the spark plugs 52€ for the cleaners and 299€ for the oils.. 380€ max and the engine is 140psi in each cylinder.. If you have money left over, get the labeled ones of course..