Oil Additives... Yes or No???

[Charlie Bravo_imp]

I am not a fan of oil additives. If the additive made the oil better, the mfr would have put it in at the get. On every bike I've ever owned, at the first oil change I put in Castrol 20w 40, which was recommended by a gearhead I knew when I first started riding my own bike, and this includes replacing synthetic oil. The bike ran better, revved quicker, was quieter, with less vibration. Of course, this is all seat-ot-the-pants data, but it has worked for me for 50 years.