No help from DSP other than referring me to their NA distributor S4 Suspension. S4 hasn't retruned emails. Just tried Loco Tuning, the UK Distrubutor, and was told they "don't supply technical information, they need to be returned to an authorised service center for service." At least the returned my email, and in less than five minutes. Anybody happen to have the oil weight and voume for a service? I know my local shop can do the service, but I need the specs. Thanks.