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Message: <blockquote data-quote="dustrat" data-source="post: 576920" data-attributes="member: 20238">If as you say you can be driving for about 20 mins before oil light goes out I doubt that it is oil pressure problem as your engine would be making lot of noise. The oil pressure switch is actually fitted into the main oil gallery so it sounds as if you have switch or wiring problem. First take switch out and poke a bit of wire in hole to see if it is blocked then put some rag beside oil pressure switch hole, disconnect positive feed from coil and get some one to turn engine over and see if oil come out OK. If good flow of oil replace switch,replace positive terminal to coil and fit a test light from switch to positve terminal on battery and start engine, test light should go out,if not you have a falty switch problem. If light does go out stop engine and replace oil pressure warning light wire and start engine again. If it does not go out you have a wiring problem.The warning light is activated by positive feed going through warning light and earthed though switch and oil pressure breaks the earth contact and light goes out.Robert</blockquote>