Bought a brand new 2 stroke mower never been used. (Victa 2 stroke power torque) it says to use 25:1 or 50:1 using there victa formula semi synthetic oil (Valvoline made). I couldn’t find any on shelf so I bought the STIHL go ultra and mixed it at 50:1. I’ve used the mower for 20hr and I thought I’d have a look see on the exhaust port side of the cyclinder. Well I don’t know if it’s already scoring or if it was because I didn’t run it in and it’s just from the initial startup lubing from new. ( I got told I didn’t have to run it in with fully synthetic at 25:1 just to stick to 50:1). It looks like 2-6 scratches on the cyclinder... I was wondering if it’s because not enough or if I should just run STIHL ho ultra at 25:1 or even 32:1.. any input would help cheers I’ll link HD photos below..