All Things Mk5 > Mk5 General Area
[SOLVED] Low oil pressure at idle
OllieVRS:
Morning update: Bad news, the oil level only dropped 150ml over the course of the track day. There's not even the tiniest puddle of oil under the car, which I was praying for.
The oil pressure light happened on long right turn, exactly at the moment I started turning in harder during the turn. But @Clarkj93 said these engines are pretty good with oil distribution so, I have no idea what could have caused an oil pressure light at that high of RPM. There was no rattling or burning smell, the latter of which happened last time I got the light.
The car is just lowered on H&R springs on OEM shocks and Eagle F1 Asymmetric 6s, so hardly slicks.
Guess it's time to drop the sump then? Or just buy an oil pressure gauge and stick it in? The old one I used was crap, so I'll buy a new one.
OllieVRS:
For reference, this is roughly where on the track around where happened. Unfortunately we didn't get a video of the lap when the light happened, this is taken from another video. I think the light happened as I upshifted to fourth. Lasted for 3 seconds and disappeared. Never reappeared. In my memory the turn was much tighter than it was in reality, so I don't think oil starvation from hard cornering was the cause.
Maybe I'll just drain the oil, inspect it for anything suspicious, have a gander around through the sump plug hole with an endoscope, check the filter for metal shavings, and if nothing's there I'll put in the new oil and see if it comes back.
ROH ECHT:
--- Quote from: OllieVRS on April 11, 2023, 08:37:34 am ---Morning update: Bad news, the oil level only dropped 150ml over the course of the track day. There's not even the tiniest puddle of oil under the car, which I was praying for.
--- End quote ---
In case you aren't aware of this; all of the modern engine oils are tested, and known to lose anywhere between 5% and 13% from evaporation alone, caused by heat. The evaporation can occur rather quickly, especially if the oil reaches a high temp...and the duration of heat exposure is another 'evap' factor.
pudding:
Your car has history with the oil light coming on, so could be related. Maybe pushing it on track has uncovered a weakness in the oil system?
I'm amazed more GTIs don't throw the pressure warning light on track to be honest as they don't even have baffled sumps!
Either way, unless the pressure sensor is knackered, you've lost pressure, so a bearing/journal or two could have suffered. Look for metal shavings or glitter in your next oil change.
Maybe try a 10W60 if consumption is an issue on track. 30 and 40 will burn off super fast.
OllieVRS:
Apologies for the spew of posts above, I'm just going crazy overthinking everything at this point, and I can't drain the oil right because the weather's horrendous here.
--- Quote from: ROH ECHT on April 11, 2023, 04:14:44 pm ---
--- Quote from: OllieVRS on April 11, 2023, 08:37:34 am ---Morning update: Bad news, the oil level only dropped 150ml over the course of the track day. There's not even the tiniest puddle of oil under the car, which I was praying for.
--- End quote ---
In case you aren't aware of this; all of the modern engine oils are tested, and known to lose anywhere between 5% and 13% from evaporation alone, caused by heat. The evaporation can occur rather quickly, especially if the oil reaches a high temp...and the duration of heat exposure is another 'evap' factor.
--- End quote ---
Wow that's more than I expected. But I meant the other way around. I meant I was hoping it had burnt more oil as that would've meant the light was caused by oil starvation from low oil, the simplest fix. In this situation i would've preferred to find the dipstick on min.
--- Quote from: Pudding on April 11, 2023, 04:33:03 pm ---Your car has history with the oil light coming on, so could be related. Maybe pushing it on track has uncovered a weakness in the oil system?
I'm amazed more GTIs don't throw the pressure warning light on track to be honest as they don't even have baffled sumps!
Either way, unless the pressure sensor is knackered, you've lost pressure, so a bearing/journal or two could have suffered. Look for metal shavings or glitter in your next oil change.
Maybe try a 10W60 if consumption is an issue on track. 30 and 40 will burn off super fast.
--- End quote ---
It could possibly be so that something internal has finally given way, but I doubt it considering the engine sounds perfectly normal, and there's no smell like the last time.
Since our engines don't have baffled sumps, do you think there's a possibility it could have been momentary oil starvation caused by a long and tight 100kmh bend? My friend in the passenger seat who was there when the light happened said it was my fastest speed through that bend. And this was after two previous hot laps.
Since the light disappeared once the revs dropped below ~2.5k (which would mean less oil pressure), I am becoming fairly certain it was caused by temporary starvation or something temporarily blocked the pick up pipe.
But I appreciate the replies as always. Hopefully this isn't the start of the end :sad1:
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