[cobrin]

you are right on the money with a slight less anti-wear performance as said, interestingly it also has the same minimum HTHS Viscosity of 3.5 mPa*s as the C3 level. C2 having the lowest minimum HTHS Viscosity of 2.9 mPa*s so I reckon it's a safe bet to say it's still perfectly suitable (C4 that is).

Given it's a daily family vehicle and driven nicely I reckon it'll do 'as usual' which is just the ticket.