Sump plug spanner size

Went down the garage to change my oil and filter but didn’t have a big enough spanner for the sump plug and I never thought to measure it for next time. Does anyone know what size socket I need? TIA

What age is your car ?

The V8’s are 13mm I think

Its an AJ16 engine and its a lot bigger than 13mm. I think my sockets went to 22mm and were not big enough.

I think it is M20 and should be a 30mm spanner. Maybe someone can confirm this. I’ll check next time I’m under the car.

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It is indeed 30mm hex.
The threaded hole is M20 x 2.5mm

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Many thanks guys, i thought it might be 28-30mm. I’ll make sure I take the right size with me next time.