Review on INA Accessory Belt Tensioner Assembly without Pulley by Jermaine Munajj

Seems to be much more durable than the original spring compressor. There was some liquid around the hydraulic part, but I think it just came from production. Mine went into a 2004 BMW x3 2.5i and required a couple of screws that were not included. I think it depends on the car whether you can reuse old hardware. Just a warning though