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[Solved] 2014 Honda Civic Mixed oil in my engine

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i recently change my oil and filter, the oil cap has C2 5/30 on it so that’s what used. But my wife topped up the oil with 5/30 C3 oil about a litre. Will this do any harm to the engine. 

Its a Honda Civic 1.6 diesel 

42000 miles a 2014 model 

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Hi, Although I'm not familiar with diesel oil ratings, According to the internet:

"ACEA C grade oils are for the most, not interchangeable with one another depending on the particular applications"

Some manufacturers have tables explaining what C3 oils are SFU (suitable for use) in C2 engines, maybe check for something like that?

Personally, I'd replace the oil just to be sure.

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