I - accidentally - overfilled wee sprinty by about 1/4 Ltr of oil. What do you recommend - drain it off or is it OK to start? Also bought some of that stuff to free off sticky hydraulic valves - can I use this in the Boxer engine??
If it was my car I wouldn't worry too much about it, if at all.
Half a pint (think of a half pint of beer) is not significant when putting in about 4 1/2 litres.
I often overfill the 147 deliberately when topping up so as to reduce the chance of it all disappearing again, like it did on the 146.
BUT . . . . that is not an invitation to go mad like one Vauxhall customer of mine that I remember from the mid eighties.
He bought a brand new Cavalier and after a few days the oil light flashed a couple of times so he topped up the oil.
A couple of days later the oil light flashed a couple of times so he topped up the oil.
A couple of days after that the oil light flashed a couple of times so he topped up the oil.
Now you can see where this is going, huh?
Two weeks after purchasing the car he brought it back to the workshops complaining that the car was "smoking really badly", the engine was "rattling like a Bugler" and he wanted his money back.
I took out the dipstick and oil flowed out of the hole!
Upon questioning him he readliy admitted to keeping the oil topped up as he "should do"! . . . . "Everytime that oil light flashed"!
The oil pressure switch was replaced and the excess oil was drained off and the car was taken for a good thrash to clear it out.