ACEA C3 will be fine.. You wouldn't want to run A5/B5 in a car that had a catalytic convertor but the other way around is fine. Make sure weight and blend is right (5W-40 fully synthetic IIRC?) and you'll be fine.
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20w40 is thicker at high temperatures than 10w30 It is desirable for lubrication at operating temperatures to be high. 20w40 is better than 10w30 at normal operating conditions.
Will 20w50 hurt my engine? A 20W/50 oil is much thinner at high temperature than a 5W/30 at a low temperature, so the viscosity will not hurt your engine.31 Jan 2021