Oil pressure switch

[darrsi]

Rather than faffing about running the engine for a specific length of time and then letting it stand for a specific length of time, I prefer to just check it when cold... mine likes it filled to the top of the window, any less than that and it gives the dreaded red light.

I don’t even have that luxury any more. My window isn’t see through.
2.8 litres in with a new filter does me until the next change.