Had one in Series1 with V8 conversion, put up with that OK for 5 yrs, good bit of kit. They all leak oil around the selector rod, and take their oil from splash in the trans box, so if you drain one you need to re-fill it initially or it will run dry for a while, then re-check trans box oil. Manual says to just only use it in 3rd & top gears to avoid too much torque.