He's already done it dude, and personally 5w30 would only go in my car over my dead body! Oil pressure fail!
I ran Shell Helix 5w30 FS for about 5k until next service that i got from work. Was no worries at all. Depends how bad you`re engine condition is in the first place lol. Back with 5w40 Quantum now though. Easier to get away with using a can on that than using the pumps in workshop.