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oil light on

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Old May 12th, 2014, 14:34   #1
s2000
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Hi can anyone help me, I have a 2002 v40 2.0 lux, it's done 165000 miles, It drives great, very smooth engine with good power, but now after about 6 mile of driving the oil light comes on ? a garage has changed the oil switch & replaced the oil, but the light still comes on? So they did an oil pressure test & the results came back as oil pressure low ? this is when the engine is hot. I'm baffled as when driving the car everything seems great except for the oil light.
Does anyone have any clues on this, is my car knackered or could it be something silly?? Many thanks in advance....
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Old May 12th, 2014, 14:56   #2
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Which Engine and year?

At best I'd say keep a consistent check on your dip stick to see if your losing any oil. Also what oil are you using? I've read somewhere that thin viscosity oil has issues in the summer with pressure and vice versa with winter.

Only other thing it could be is the pick up in the sump is clogged maybe? But that's a drain and drop sump job!
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Old May 12th, 2014, 15:13   #3
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Hi it's a 2.0 T4 Sport Luxury Auto (2002/52)
I don't know which oil was used, the oil light comes on solid, but as I say engine sounds sweet. I just found out the garage didn't do a oil flush if that means anything? They just changed the oil & oil filter..
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Old May 12th, 2014, 16:08   #4
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It might be sludged out, in which case it's best to drop the pan and clean out the sump and oil pump intake screen. If the engine has any oil leaks, just do a series of short oil changes to help clean the block. If it's a non dripper, then use an idle flush just before each oil change. How quickly the oil turns black will give you a good idea about how long an oil change interval is good.

If the engine is using oil or has any leaks, switch to either Castrol GTX 15/40 HM (Summer only) or Valvoline Maxlife 10/40, as both are fairly cheap and contain seal conditioners.

If you want to supply the engine oil, Shell Ultra 5/40 and Mobil 1 0/40 are both good cleaners. Keep the next few oil change intervals short even if the oil does not turn black, say 3K miles only, as that will help clean the rest of the block.

The first indication of sludge obstructing the oil pump intake is often a flickering low oil pressure light at idle, just after a good run. Sludge is a silent non smoking killer, so you don't get much of a warning, although finding any kind of lumps in the old oil is not a good sign.

How long have the previous oil change intervals been and are you using any coolant (Even small amounts of anti freeze in the oil can result in sludge formation)?
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Old May 12th, 2014, 16:26   #5
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Hi, The car is quite new to me not had it that long, it has a full Volvo service history so has been serviced once a year, but a service is due now. There was no oil light flicker before this happened & there is no loss of coolant.
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Old May 12th, 2014, 23:05   #6
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Quote:
Originally Posted by skyship007 View Post
It might be sludged out, in which case it's best to drop the pan and clean out the sump and oil pump intake screen. If the engine has any oil leaks, just do a series of short oil changes to help clean the block. If it's a non dripper, then use an idle flush just before each oil change. How quickly the oil turns black will give you a good idea about how long an oil change interval is good.

If the engine is using oil or has any leaks, switch to either Castrol GTX 15/40 HM (Summer only) or Valvoline Maxlife 10/40, as both are fairly cheap and contain seal conditioners.

If you want to supply the engine oil, Shell Ultra 5/40 and Mobil 1 0/40 are both good cleaners. Keep the next few oil change intervals short even if the oil does not turn black, say 3K miles only, as that will help clean the rest of the block.

The first indication of sludge obstructing the oil pump intake is often a flickering low oil pressure light at idle, just after a good run. Sludge is a silent non smoking killer, so you don't get much of a warning, although finding any kind of lumps in the old oil is not a good sign.

How long have the previous oil change intervals been and are you using any coolant (Even small amounts of anti freeze in the oil can result in sludge formation)?
Ok I'm going to try a new oil filter, flush & clean out the sump - pickup, & put in the oil as above, but I thought I would do a oil pressure test first & again after the work is done, do you know what the pressure should be ? Thanks again..
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Old May 12th, 2014, 23:11   #7
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Only other thing it could be is the oil pressure switch. If your down my neck of the woods I'm happy to plug in my DICE kit to your car and see if there's any codes.
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Old May 13th, 2014, 00:07   #8
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Quote:
Originally Posted by s2000 View Post
Ok I'm going to try a new oil filter, flush & clean out the sump - pickup, & put in the oil as above, but I thought I would do a oil pressure test first & again after the work is done, do you know what the pressure should be ? Thanks again..
I can't believe the garage changed the oil, but not the filter !
A clogged filter would cause low oil pressure !
Oil pressure @ idle... 1 bar (14.5psi)
Oil pressure @ 4000rpm...3.5 bar (51psi)
Engine hot with a new filter.
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Old May 13th, 2014, 00:35   #9
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Quote:
Originally Posted by magnuz View Post
I can't believe the garage changed the oil, but not the filter !
A clogged filter would cause low oil pressure !
Oil pressure @ idle... 1 bar (14.5psi)
Oil pressure @ 4000rpm...3.5 bar (51psi)
Engine hot with a new filter.
Seriously? Ok note to self never assume someone automatically changes oil and filter.... even if it is common practice...
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Old May 13th, 2014, 05:50   #10
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Just to confirm the OP did state the oil filter and pressure switch were changed. The garage did some kind of pressue check, so this is probably a sludge case, as it's rare for an oil pump to fail.

The thing I find strange is that there was no flickering light first and the full service history. It's possible that the car did a lot of short tripping and the Volvo dealer was using not using Castrol Edge, as 10K mile oil services can be pushing the limits sometimes.
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