We're getting our trusty W203 ready for it's 2,000 mile charity adventure. So it's having an oil & plug change which we're doing ourselves (or rather my co-driver / co-pilot is doing the work). Anyway, for the engine oil sump plug, when we re-fit with the new copper washer is it a case of tigthen up by hand ensuring the washer is compressed, or is there a recommended torque setting please? Seen some conflicting numbers online, so just wanted to see if there was anything definitive from MB or anyone else from experience. Thanks in advance!