Help! Oil light at low revs

[EssEss]

Hello, can anybody help me please?

Changed the oil and filter on my 53 plate Cooper S last weekend and today, the oil light decided to come on. It only lights up when it is warm and idling, as soon as I increase the revs, the light goes out.

Found out today that I was sold the wrong oil... lovely Halfords staff gave me semi-synthetic instead of fully. So dropped the oil and replaced it with the proper stuff and changed the filter again...light still on.

Ive been told that it might be a problem with the filter? (Halfords again- desperate measures!) Ive ordered one with BMW but Im not convinced that this is the only issue (although I hope it is!!)

Any help greatfully received!)

Sarah.

[DaFlake]

I assume that you checked the oil level and don't need to add some oil? Sounds like a pressure problem.

[EssEss]

Yep, checked the levels with both changes and its fine. No leaks as far as I can see either. Never had any problems with the light before the oil change.

[mab01uk]

First things to check are that filter is correct type and that it is correctly fitted. According to the Haynes manual "MINI One/Cooper up to 07/2004 have a guide sleeve and spring fitted between the element and cover, Cooper S models and vehicles manufactured after that date do not have the guide or spring. Do not remove the guide sleeve and spring from the cover."
Also check / replace the oil pressure switch and / or wiring to it. Oil should be 0W-30 Castrol Edge or similar in UK climate. Some other useful info maybe here:-
http://www.mini2.com/forum/faults-fi...oil-light.html

[DaFlake]

I also remember hearing that someone had an STP filter and the ring supplied for the canister was the wrong size. It bunched up allowing a pressure leak that caused low pressure when idling. This in turn caused the light to come on.