I know its been asked to death but...

Iam due to mrc on weds for a service,health check, diff and gear oil change etc.

Popped out to check car over today and found oil on the minimum, then after a drive as it says check warm it was still basicly on the minimum.

Only having recently purchased it and the guy before only did the long life service, question being if i buy some oil just to top up uintil weds will it cause any issues?

for example 5w40 just to see the level up a bit, or idealy should i top up with whats already in there?

thanks