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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22933
Experience:  BEng hons Mech engineering, in auto industry 22 years
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, I have had the engine oil warning light illuminating

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Hi ,
I have had the engine oil warning light illuminating a few random times ( the engines has not had any death rattles ) .I had it checked out by a local garage who couldn't find any untoward so we thought may be a faulty sender .The problem then disappeared until a few days go when the light came back on, so I had booked it in to have an new sender fitted. A day later the light went out but found that oil was being leaking from the engine somewhere and getting onto the exhaust and burning off .I have managed to get it to a local garage where it is awaiting investigation . I have noticed a smell of hot rubber coming from the engine after a few miles travelling . So what is the expert's opinion or do I take it down to the vets for euthanasia ?

I'd 1st suggest measuring the actual oil pressure with seperate mechanical gauge - this can be plumbed into the engine via the current pressure switch port - if you use a Tee piece you can keep the pressure switch plumbed in as well and so see if the low pressure light corresponds to a low pressure reading.

As its intermittant and you have no rumbling or rattling noises from the engine its likely to be an electrical fault so 1st check the connection to the pressure switch is bright and clean and check back along the switch wiring for any signs of damage to the insulation

As if the wire is grounded out at any point then this will also turn on the light.

If you do have a low pressure reading ( should be 4 bar (59psi) at 2000rpm) and to turn on the light it will be very low about 5psi then replace the oil pump and ensure that the pump pickup in the sump hasn't come loose or is blocked

Customer: replied 3 years ago.

Thanks, ***** ***** question I need to answer is : - where is the oil leaking from ?

Hello Howard

these engines are very prone to leaks from the cam / valve cover and also from the turbo oil return pipe , the driveshaft output seals on the gearbox are also prone to it.

if its been leaking a while then its best to clean everything off with brake cleaner then run the engine some more to try and determine the origin of the leak
Customer: replied 3 years ago.

Hi Matt,

The leak came from a faulty oil pressure switch . I have not come across that in 50 years of motoring but quite common according to the local garage who charged a very modest 25 quid for replacing it.I was worried that it would cost 100's as it was already up for sale.



Hello Howard

that wasn't one I'd heard of

thanks for letting me know

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