Oil warning light

Had the 1996 1.1 carb model for 6 months now.
when i first bought it the oil warning light would appear after motorway journeys but now it comes on a lot, only when i'm coasting or with clutch down at junctions when revs have dropped.
Any ideas whats causing this? i keep checking oil level and its fine
using 10w 40oil, doubt this has an effect.

thanks.

hello, sounds like system is working have you checked oil pressure sounds like its dropping low enough to trigger the light

How do i check the oil pressure?

you'll need a guage not to sure where the sending unit is on your car but check around the oil filter you need to remove & install the guage there or you can replace the sender unit if you dont have a guage they are'nt exspensive & see if thats your problem.Good Luck

the oil sender is on the back of the engine underneath the inlet manifold. Make sure the wire is on ok, and buy a new sender. they cost about £3.
If the fault is still there and you're sure the wiring is ok, then i think your engine is gonna die. get a garage to check your oil pressure properly before you scrap the engine though