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I have feeling that the discussion of viscosities etc. is a red herring in this instance, and that there is an underlying problem that has not been solved. Let me explain. The oil pump should be capable of creating much more pressure than is required by the engine in order that the pressure is adequate at idling speed, no matter what viscosity of oil is used, any excess pressure as the engine speed rises being bled off by a pressure relief valve to maintain a more or less constant pressure in the oil galleries. In this case the pressure is not high enough to prevent the warning light showing, so the question becomes why that should be. The possibilities that occur to me are: [1] The oil pump is worn. [2] The pressure relief valve is faulty. [3] The engine bearings are worn. [4] The pressure switch is faulty. [5] The pump is sucking in air. Unless anybody can add to that list, or disprove my logic, the problem must be one of those five things. I know that some of those parts have been renewed, but even new parts can be faulty or incorrect for that particular vehicle. Furthermore I see no investigation reported yet of items [3] and [5]. What say you chaps?

Hi Gareth. Many thanks again. I am just waiting for the dealers service dept to call me to possibly arrange for them to look at the car. I will definitely let you know the outcome. Hopefully nothing much!