I think they're good. I just did oil analysis on Yamalube oil with OEM oil filter and it came out with good results. They told me I could run the oil for 10.000 km with no issues, I had 7.000 km on it when I changed it. I changed to AmsOil 10w40 and an AmsOil EA oil filter to see how it does compared to Yamalube and OEM oil filter. I can post the results if you're interested as well as the future oil analysis when I change the AmsOil in about 8.500 km.