What a can of worms,

Like many have already posted, carry a 10/40 semi synthetic and Ford formula F 5/30, would probably have covered most cars 10 years ago, today no way,
I probably stock 7 to 8 5/30 brews, most of the Quantum range in 20l barrels, Ford have a specific ecoboost oil, a recent Volvo I had in used Castrol edge at £16 a litre, nearly a £100 just on oil !!

I have just been cancelled by a customer with an 08 Toyota Auris, Full service and MOT, quoted £200 all in , and Toyota beat my quote, and they would give her a free courtesy car, that must be a loss leader surely ??