Octavia 1.5 petrol 68 plate. 
anyone know the size of sump plug washer to use. Seem to have forgotten.

also, what oil is best.

many thanks 👍👍👍

If it's the standard VAG sump plug then the washer comes with a new sump plug as the washer is captive (I've never had one fall off on me anyway). I believe you could get it off if you wanted though.

 

I have never bought a new sump plug for any VAG car I've ever had and never had one leak yet.

Same as me, I used the same sump plug for the third time. I have a new one just in case, but upon close inspection was not necessary to replace it.