low oil pressure

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Manufactured from 2004 to 2011

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b754984
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low oil pressure

Post by b754984 » Mon Jan 22, 2018 12:14 pm

Hi everyone,

I have been recently getting the red "low oil pressure" light on and off since last 2 weeks.

Some more info:

- low oil pressure when engine is warm, mainly after coming off the highway + idle, never when engine cold
- no abnormal engine noise
- no oil leaks found
- oil pressure sensor is working ok
- oil has been changed (5w30 and 5w40) - no avail
- car has been running fine otherwise (after told I could drive it)

At this stage I catch myself wondering if this could be an oil pump or even the symptoms of a major engine problem.

- I've been told it is unlikely to be an oil pump otherwise the car engine would have been damaged by now, is it so?
- Sludge. Should I have been told about this after the oil changes?
- Any efficient tests/checks which can be performed? Does the ECU provide any helpful info for this kind of issues?

I have an appointment soon but don't want to just come home with "an oil change and good luck" once again. :|

thanks!

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Re: low oil pressure

Post by BMWBrad » Mon Jan 22, 2018 2:43 pm

Is your car the 2.0 Petrol N43? The timing chains stretch on these, and the chain guide can break and fall into the sump which blocks the oil pick up.
Get it checked ASAP at a garage
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b754984
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Re: low oil pressure

Post by b754984 » Mon Jan 22, 2018 5:43 pm

It is actually a 1.6 N43 petrol, time chain has been replaced recently - hopefully they did a good job there.

Jack79
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Re: low oil pressure

Post by Jack79 » Mon Jan 22, 2018 8:33 pm

The chain guide wasn't broke? If they fall into the sump which blocks the oil pick up like BMWBrad wrote.

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marco_polo
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Re: low oil pressure

Post by marco_polo » Mon Jan 22, 2018 8:39 pm

From the symptoms, it sounds like an internal leak to me. Relatively oil-tight when the oil is cold/thick, but seeps past seals/pump when hot/thin.

BMWBrad wrote:
Mon Jan 22, 2018 2:43 pm
Is your car the 2.0 Petrol N43? The timing chains stretch on these, and the chain guide can break and fall into the sump which blocks the oil pick up.
Get it checked ASAP at a garage
I'm not saying you're wrong, as it's a common N43 cause, but wouldn't a blocked oil pick-up be just as bad (or worse) when cold?
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Re: low oil pressure

Post by BMWBrad » Mon Jan 22, 2018 8:43 pm

Good shout Marco, although I’ve seen them to bring on the warning in all conditions.
I’ve also known an oil pump to fail on these, but broken guides seems most obvious to me.
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Re: low oil pressure

Post by b754984 » Tue Jan 23, 2018 2:49 pm

Thank you guys. I'm looking forward to finding out what's going on here.

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Re: low oil pressure

Post by b754984 » Fri Jan 26, 2018 7:48 pm

Well, took to the dealer today for a general check and among other things I was given a quote of $ 500 to open the engine and check for chain guide debris, sludge, etc

I’m happy to get them to check it but if there is a chance the engine may already be showing signs of damage I’m not sure it would be worth all the trouble and money spent on digging it further.
Is there any cost beneficial way to check for related engine issues at this stage?
If there is an engine problem I have the possibility of returning the car.

I bought the car recently and the thought of spending 500 $ just for a “check” is already bad enough, let alone the cost of a potential fix for it. Not really sure what to do...

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Re: low oil pressure

Post by marco_polo » Fri Jan 26, 2018 7:52 pm

If you can reject it, reject it.
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b754984
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Re: low oil pressure

Post by b754984 » Fri Jan 26, 2018 7:59 pm

I could but I dont know yet if there is an engine problem, so I thought that perhaps would be wiser to check that first if cheaper - and possible at all.

Thats why I’m curious if there is anything that could be done to indicate that other than taking the engine apart straight away.

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Re: low oil pressure

Post by Octavius » Fri Jan 26, 2018 10:59 pm

Could you not drop the sump off ?
MY SIGNATURE STOPPED WORKING AFTER AN UPDATE.

b754984
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Re: low oil pressure

Post by b754984 » Sat Jan 27, 2018 9:27 am

I would really like to but I personally feel unqualified for this kind of work, at least at the moment. :-/

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