Tyre pressures for non standard wheels

[focusxr5]

Just bought a 2012 C220 CDI AMG Sport Estate. Absolutely love the car but I'm always really careful about stuff like tyre pressures etc. The issue is that the cars' standard wheels should be 18" but it's sitting on a set of 19" C63 wheels. I know the standard pressure for the C63 estate would be 38 but would that be correct for my car due to different weight etc?
Thought you lot could help out with that one.........hopefully

Thanks

[jon-]

Stick with the manufacturers recommendations for your vehicle and application.

There's some variance allowed in tyre pressures, so if you want to change how the car feels feel free to have a play +-2psi