Which is especially galling when it's some cheapo muck, synthetic or otherwise,
that they probably pay about 50p a litre for - or less
Picture the scene... I peruse dealer service bill to see 53quid for oil - Jeeperz!
Point out that in 5 secs with a browser, found shop with same oil for 24quid.
Dealer reduces cost to 27quid... ok that'll do.
I mention the (very good) BP stuff at work and that it's only £1 a litre bulk.
Blimey says service manager - that's expensive..
followed by embarrassed look as he realizes what he's just implied
As Colin says - supply your own, don't get fleeced !!