90xp

I was doing my first oil change on my new to me 90xp chipper . Grabbed some 15w 40 semi synthetic oil at walmart and apparently it was not stocked with the same oil so 3 quarts of 10w30 was put in before i realized the mistake and finished with almost 6 courts of 15w 40 all the oil was the same...

Just changed knives and cleaned everything with gum out carb cleaner/parts cleaner after hearing stories of blades coming loose due to not cleaning threads and dirty surfaces . After doing some research looks like carb cleaner can leave an oily residue do you think this will cause any issues ...

I have a bandit 90 and the bolts are shearing or snapping it looks like the blade is hitting the anvil . Did adjust anvil with more clearance and the bearings are only about 1 year old had a friend do them . The previous owner had a blade come loose and they repaired it is it possible that it is...

need to replace the disc bearings on 90 xp only one side is bad , its the side near the anvil any tips would be very helpful it almost looks like there is a retaining ring around bearing several small holes but did not seem like there was any allen head inside of it . looked online did not see...