Topped up my IS250 with mostly 10W30, but that wasn't enough. So I used a little bit on Castrol Magnatec 10W40. I know mixing oils is best avoided, but is this ok for the time being?
Hoping to get my car serviced with my local mechanic, I believe he stocks Magnatec 5W30, not sure if he has 10W30 like the dealership.