Flickering oil light
The oil light on my 2002 Disco (175K miles) started to flicker about two weeks ago. The light would flicker on after the truck was well warmed up, just as I applied gas after idling. I took it to a local shop immediately for an oil pressure test. The results were:
Not quite cold, but only slightly warm
Idle, in park - 22 psi
2000 rpm - 44 psi
Well warmed up
Idle, in gear - 14 psi
2000 rpm - 42 psi
Mechanic replaced the oil pressure sender after completing the test. I asked my Land Rover shop about the numbers. While not perfect, they felt they were reasonable for a truck with 175K miles. I drove the truck for 10 more days without the light coming on at all, and that led me to believe it was, in fact, a faulty sending unit.
This past weekend, I left my truck parked at the airport for 4 days while I flew to LA to see my daughter. Wouldn't you know, when I drove home from the airport last night, the darn light started to do the same thing -- flickered on after applying gas from idle.
Now I'm really confused. Do the test numbers seem satisfactory? If it really is the oil pump, why did I go 10 days without a blink after replacing the sender?
Any thoughts would be greatly appreciated. I'm worried about the truck's health and longevity.