From the research our shop has done, every company has had some issues with the sleeves leaking, not to name names, but some way more than others. I promote the AEBS sleeves because out of all the research I have done, they seem to be the most problem free. And the ones in my motor have been perfect so far. There is not a product out there that doesn't have a few horror stories, you just have to do some serious research and make the judgement call off of your findings.