im pretty sure acf50 helped put an end to the shock on my commuter. That and 4 miles of rutted and potholed green lane over the moor. It wasn't whilst on the move it went, it was whilst parked up afterwards, just shat it's load over the car park which had me imagining it doing its 'creep' thing past the seal. Probably bad logic but I reckon I could convince a paying/warranty customer it was that.