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by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Dec 2008
Posts: 22,366 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,366 Likes: 354 |
There's a relief valve on the oil pump which opens when the pressure reaches a preset level. Historically this was achieved by nothing more than a coil spring. I suppose it could be fancier these days, but the principle is the same.
Overfilling can aerate the oil and reduce pressure if the big ends touch the surface, and can contaminate the cat, but I've never hear of an example of this.
Someone I know had a fuel system fault on a Mini. Overnight the fuel tank siphoned a large amount of petrol into the sump. Even with this, it started and ran roughly. I don't remember if there were consequences though!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2011
Posts: 1,245 Likes: 30
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2011
Posts: 1,245 Likes: 30 |
Thanks Dave. Had mine on a run reading over 5 bar. Hasn't done it since normal at 70mph is 3 bar.
4/4 Ivory 4.1:1 axle, Mercedes A200 AMG
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