My friends MK3 Golf failed its MOT on emissions last week.
I have done an oil and oil filter change.
He has now put V-power in the tank and we were also thinking of getting some injector cleaner/engine flush. He has already bought some emission reducer (Wynns) and put it in.
If he gets some injection cleaner/engine flush can he put it in now with the emission reducer or would he have to wait until he has used up the tank with emission reducer in?