| On a KTM forum someone recently posted: " has anyone been having issues with the bottom ends in the 2024 KTM SX125? Mine went at 20 hours from new, I then rebuilt the crank and the bottom end went at 8 hours. Any ideas why this maybe happening?"  I replied: I think they set the fuel injectors to be lean so they'll pass regulations. That means that the engine will run hot and less oil will go thru it. A too hot engine evaporates off all group 1 mineral oil because its flash point is only around 70C. So I'd recommend any semi-synthetic oil that includes group 2 mineral oil instead of group 1. And I'd multiply your normal fuel oil ratio by 0.75 for more oil, or just run 25/1. Your Penrite oil has around 17% group 1 oil according to its safety data sheet. Most companies lie when they say its fully synthetic. But I'd prefer an oil to also have group 2 mineral oil in it because mineral oil is better for bearings as long as it doesn't flash off. Motul 800 has 6% group 2 oil. To see what oils are in each engine oil go to dragonfly75.com/moto/oil.html and if your oil isn't listed there then just look up its safety data sheet, find the CAS # of any oils listed, and look them up at dragonfly75.com/moto/CAS.html to know their specs and which group of oil they belong to. And here's my video about group 2 mineral oil: https://www.youtube.com/watch?v=lsRa1xeQjS0 |