These are constantly leaking oil. I have wiped off the oil numerous times, but it keeps seeping out each time I turn the knobs. These tuners look very nice, look nearly identical to the Fender and Schaller brand tuners, which I also own, and those do NOT leak oil. Those name brand tuners are probably better sealed inside, or maybe use a thicker grease which does not leak out.I cannot recommend these tuners, as it is slightly messy, and if they keep leaking oil, the gears inside will most likely dry out and become hard to turn down the road.