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OIL LIGHT SHOWS AT IDLE AND TURNS OFF WHEN ENGINE SPEED IS INCREASED HELP!!!!

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landymad:
I have recently changed my engine in my disco 200tdi. however whenever i drive the car for a long time the oil warning ight turns on when the car is idling. However when the engine speed is increased only slightly the oil warning light turns off. when the car is cold the oil light is off. i took the car to the garage and they suggested changing the oil filter and changin the oil grade to 15/40w. i did this today however the oil light still turnes on. today i also changed the oil pressure switch and tested the temperature switch which full opens and closes. CAN ANYONE HELP ME PLEASE

cheers

sam

s@mbarfoot.com

Disco-Ron:
Do you have the oil cooler in the radiator plumbed in..???  sounds as though the oil is getting too warm, and therefore too thin.... hence not being pumped well enough at tickover.......

Oil grade is important, oil level matters just as much.......

russ3120:
I have the same problem
changed the oil filter, changed the oil and still the light is on when warm at idle

beast5680:
this might sound dumb but is the idle set too low?

Range Rover Blues:
Oil gest thinner as it gets hotter and the engine oil pump produces more flow/pressure at higher pseeds.  These 2 things combined give exactly these symptoms.

Possible causes,
oil pump past it's best,
the pressure relief valve in the pump faulty or blocked
oil too thin/wrong grade
excessive wear of the crank main bearings
faulty head gasket

Head gasket I hear you say, well run the engine and look inside the rocker cover, if there is loads of oil in there then too much is going to the rocker chamber too fast, the flow of oil into the head is regulated by a throttle plate in the head gasket 9there are more for the water jaket) and it's like a little silver disk with a hole in it.  if that disk was dislodged during the build then the oil flow to the head would be too great, thus starving the crank and reducing oil pressure. 

That said I would obvioulsy expect that on an engine that had ben apart at some point.

As a first option I would use this oil . because the stabiliser will protect your engine if the oilpressure falls but also it will maintain it's viscosity over the full service period.

Otherwise try this, it's thicker than normal for you engine but if you still see the oil light then you have more significant problems, Again it has the oil stabiliser.

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