I'm planning to change my engine oil. However I noticed I accidently bought C3 instead of A3/B4 which is currently in the engine. The operating engine is a Corsa C 1.4 from 2002. Could this do any harm? Should I return it in favor of the A3/B4? In the user manual A3/B4 or higher is recommended, but isn't mentioning C3 at all. Thanks!