Which oil spec?

[mattylondon]

I would say no. But the full answer really depends on how hard you drive your V10 Marcin. Are you frequently hitting the rev limiter? Using the paddles to keep the engine above 5k rpm? Track time?

The R8 GT is probably expected to be driven hard and the odd track use resulting in a higher engine temp and thus an oil which has a specific viscosity at that engine temp. Also, is this a dry sump V10 like the Lamborghini?

Connect up VCDS and log the oil temp and RPM so we'll know the peak and usual temp with your driving style. With this we can see if 10w60 is for you.

The correct viscosity should be used for the working temp of the engine.

The downsides of the thicker 10w60 is greater friction when cold resulting in a loss of power to the wheels, also slight localisation of heat spots as the oil is thicker and slower to move.