Will be fine - I develop oil for a living, and as long as the vis grade is close enough you'll be fine - it's more important to make sure it's formulated in decent quality (full synthetic or decent semi-synth (hydrocracked) base oil, with plenty of decent industry approvals (the newer VAG and MB approvals are normally among the toughest to pass, so good to look out for...). Castrol edge wll be fine in the cup...
I see the effect that oil formulation has on the internals of engines and transmissions (we run a lot of engine and transmission tests at up to £150K a pop!) - and would never choose an oil based on saving money again!