One of my sister's dodgy boyfriends worked in a main dealer in London. They used to get loads of company cars in for their regular service. Standard treatment was a 'spit service': ie, open the bonnet, look at the engine, say 'yeah, looks fine', spit on the engine block and close the bonnet. Their mechanics were routinely handing in - and being paid on the basis of - timesheets showing 150+ hours a week. Why should the guv'nor give a shoot? Every hour was being charged out to punters with a 70% markup.