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why does my oil light come on when on low revs?

why does my oil light come on only when my citreon dispatch van is ticking over and alright when moving is it the oil pump
julian, July 2007
A/ Check the actual oil pressure; switches can age and operate at un-neccessary high pressure; replace it with an oil pressure gauge either as a tempory or, my prefference, permanently. ( You can keep both by using a tee fitting. )
B/ Use a high flow / low back pressure oil filter.
C/ Check idle speed is not too low.

GMR, July 2007
Low oil level, Wrong oil, Oil pump, worn engine.

t, July 2007