Sorry about your u-joint headaches. The cheap ones are less resilient as you noticed. When hydrocarbons (such as from blowby or imperfectly metered fuel) hit t

Sorry about your u-joint headaches. The cheap ones are less resilient as you noticed. When hydrocarbons (such as from blowby or imperfectly metered fuel) hit the substrate it works against the catalyst chemistry and the catalyst produces combustion clearing it up. But this skyrockets the temperatures, damages or melts the substrate reducing its effectiveness using up the substrate. There is a lot of expansion and contraction in a 1000-degree cat, failing ones can double that, so the poor bonding techniques will turn it into a rattle can fast. Thin walls, less substrate, and poor bonding lead them to fail prematurely. Good luck.