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Author Topic: Slight petrol smell in oil?  (Read 689 times)

Offline Kierandewberry21

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Slight petrol smell in oil?
« on: November 29, 2022, 10:26:14 am »
Hi guys. I noticed the other day when checking my oil cap for the ‘Mayo’ from short journeys and colder weather that it has a slight smell of petrol.

After a longer drive it can barely be smelt but in the mornings after it’s been sat overnight it’s slightly stronger.

I’ve been monitoring the oil level over past couple weeks and it’s dropped very slightly from oil being burned so it isn’t rising.

I’ve been told by someone else that has this that it’s just because of colder weather now in the UK. I do also get a bit of Mayo from condensation.

Can anyone see comfirm a smelly oil cap?
Cheers


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Offline Octoparrot

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Re: Slight petrol smell in oil?
« Reply #1 on: November 29, 2022, 01:30:04 pm »
When I've checked my oil I've often thought it smelt a bit "petroly"

Offline Kierandewberry21

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Re: Slight petrol smell in oil?
« Reply #2 on: November 29, 2022, 03:01:55 pm »
When I've checked my oil I've often thought it smelt a bit "petroly"
Yeah I’ve seen quite a few people saying this. It’s nothing like opening my filler cap and smelling that


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Offline pudding

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Re: Slight petrol smell in oil?
« Reply #3 on: November 29, 2022, 03:21:17 pm »
Yes that's normal, and it's even worse with a remap  :grin:  It's just unburned fuel/rich mixtures getting past the piston rings and into the crank case, which the oil absorbs.

The irony being Direct Injection engines are supposed to be efficient, lean burn blah blah.....  :grin:

I've owned carburettor cars, port injection cars, DI cars, diesel cars...... they all do exactly the same thing to the oil, in spite of all the EU emissions BS!  The advancements in fuel delivery have been so minor vs the massive amount of tech required to achieve slightly more efficiency than a carburettor  :grin:





2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline Kierandewberry21

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Re: Slight petrol smell in oil?
« Reply #4 on: November 29, 2022, 05:35:44 pm »
Thanks pudding


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