Didn't mean to be rude Rattle, thought you were having a go at us Robbie owners....my apologies

. I believe you can do much more advanced things yourself but not to pull a plug and drain some oil and then fill it like you do after checking it daily seems crazy.
If anyone can direct me to a supplier in the UK, I would be much obliged. I wasn't aware that they used that much oil, so thanks for the info.