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Old 02-05-2019   #1
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Gasoline smell in oil

Hi guys,

I changed oil 1 month ago and today I felt gasoline smell on dipstick. It smells more like gasoline than oil...is it normal? I think that oil level is the same as was
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Old 02-05-2019   #2
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Re: Gasoline smell in oil

And this is maybe related to my ticking noise issue which is directly depending on engine temp. On cold engine no ticking. Once it starts warm up, there is cyclic ticking like 6 ticks and then 2 seconds silence. Once enginec reach operational temp, rpm immediately goes down to 700rpm and ticking is there, louder and constant. Maybe this is related to faulty injector which cannot hold gasoline properly. And thats why I feel gasoline in oil... what do you think guys?
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Old 02-05-2019   #3
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Re: Gasoline smell in oil

i could be way out here BUT valve clearences?..sticking tappet/lifters?...
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Old 02-05-2019   #4
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Re: Gasoline smell in oil

Clearances were checked. New timing belt, water pump, 2 times changed oil Selenia K + filter , new sparks, everything. But 1st I need to confirm that petrol smell on dipstick - is it also on your car?
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Old 03-05-2019   #5
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Re: Gasoline smell in oil

No smell on either of the gp's I look after.
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Old 03-05-2019   #6
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Re: Gasoline smell in oil

:-( Thanks for info. I checked smell on my Renault Fluence 1.6 (2013) dipstick and I felt also gasoline, but there is oil more than 1 year. I think that smelling gasoline so strong in 1 month oil isnt normal :-(
So regarding my ticking problem, which still wasnt idetified from where it goes - but it's somewhere behing exhaust manifold, maybe inside engine block - maybe this very specific high ticking is caused by one of piston rings on concrete valve. But because I have no oil burning (oil level ok, no steam from exhaust) , and compression is ok too, maybe one of injectors is leaking. That would explain that smell olin oil and because of poor lubricatoion between piston rings and cylinder wall it causes this specific teperature-related ticking. Fuel consumption is good so maybe ots only problem at its beginning. I measured injectors resistance (15,8 ohm each), but its not relevant parameter.
Ok, I'll listen engine block sounds on hot idle with screwdriver or something (before I checked only upper side, head, injectors...), and 2nd step will be inspection + cleaning injectors
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Last edited by Rado77; 03-05-2019 at 11:01.
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Old 04-05-2019   #7
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Exclamation Re: Gasoline smell in oil

Gas smell in the oil after 1 month is definitely not normal at all.
Injector(s) can be leaky. Also MAP and exhaust system (lambda sensor) can cause fuel overdose.

Injectors "cleaning" is not enough. You should check the "spray pattern" too.
https://www.youtube.com/results?sear...+spray+pattern

As for valve train, guy above suggested sticking valves, tappets or worn springs.
You don't listen.
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Old 04-05-2019   #8
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Re: Gasoline smell in oil

Be sure that I'm listening! ;-) I'm only looking for:
- cheapest way
- identifying of concrete issue instead of changing this and that
- car is used daily

And that's why I'm labouring, gathering information from you guys (thank you very much!). Today I receive car sthetoscope so I definately identify if ticking is going from head or engine block. I wrote to service for pro injectors check on machine - here I need to remove injectors for them and they want 20 eur for this
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Old 04-05-2019   #9
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Re: Gasoline smell in oil

Looks like too high pressure in head?
I heard ticking noise with sthetoscope and it's really going from cylinder head from cylinder 1 or 2. So three problems together:
- ticking noise on hot from cylinder head
- oil smells like gasoline
- high pressure in cylinder head

OK, I'll claim this under 1 year waranty as "hidden issue". Engine was definately cooked (wry exhaust manifold, burned oil pieces in head & VVT electrovalve)
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Old 05-05-2019   #10
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Re: Gasoline smell in oil

High (gas) pressure in head is due to piston rings leaking @ cylinder walls.

Either a worn engine or a broken ring, which by the way might explain your ticking noise would cause this "puf-puf" when you remove the oil filler cap with the engine idling. I'm afraid a worn engine wouldn't be covered by any warranty, and unless you can prove it or have a trusted witness if it's a broken ring it could very well be "hidden" by the mech who sold the car, during dismantling ...

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Old 05-05-2019   #11
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Re: Gasoline smell in oil

A broken ring would show up in compression test. and/or it would burn oil.

Oil smelling of petrol is totally normal in certain circumstances:
-car has been recently cold started.
-regular short trips.

I don't see that much pressure at the oil fill cap, it jumps around because of the vibrations, and oil drops are thrown out because of the cams turning.
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Last edited by aurick86; 05-05-2019 at 08:21.
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Old 05-05-2019   #12
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Re: Gasoline smell in oil

Quote Originally Posted by aurick86 View Post
A broken ring would show up in compression test. and/or it would burn oil...
Not necessarily, rings are generally going by 3: the top one is the "fire breaker", the mid-one is the sealing ring and the bottom is the "oil sweeper"

A worn "sealer" might still keep the (relatively low pressure) compression in the cylinder and leak under the high-pressure combustion stroke, letting some gases reaching the low pressure side of the engine.

A broken "oil sweeper" might still be in place, even in two or three pieces and do its job together with a nice ticking.

Anyway, at this stage, all can only be conjecture and the best solution would be to open for autopsy ...

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Old 05-05-2019   #13
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Re: Gasoline smell in oil

Thanks guys. Yes car is doing only short trips. Very short trips because wife's work is appr. 2.5 km from home. So daily usage is really short - from work to school for child and then 1 km home.
So what do you think overal? Do I have to claim that ticking? Proofs about engine overheating I have. Regarding oil cap, I cannot decide if the pressure is really high or normal. The fact is that it doesn't shoot oil cap away or someting like that.. :-) Oil cap was only "dancing" when I unscrew it....so maybe normal. The thing is that car is running ok, starts are ok, ride is ok, only this ticking (whioch is sometimes there on hot, but sometimes not, sometimes it's cycling like 16 ticks and then 2 seconds silence, and sometimes is ticking really noisy, but sometimes still there but quiet). I don't hear it in interior.
Car was bought in second hand. So previous owner has to sold it with almost half price to them as I know their business...for car with 55tkm and 5 years it was very low price (appr 2800-3000 Eur). So previous owner knew that car is "damaged somehow" becuase of overheating/neglected servicing. So he was happy that they gave him 3000 Eur. But - once second hand company bought that car, they took also responsibility for technical status of car. And on acceptance protocol there was nothing mentioned in engine section. So it's hidden issue and I believe that I can claim it (expect repairing by themselves or give back 1000 Eur). I documented everything, timeline, with pictures what has been done and so on...
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Old 05-05-2019   #14
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Re: Gasoline smell in oil

Quote Originally Posted by Bernievarian View Post
Not necessarily, rings are generally going by 3: the top one is the "fire breaker", the mid-one is the sealing ring and the bottom is the "oil sweeper"

A worn "sealer" might still keep the (relatively low pressure) compression in the cylinder and leak under the high-pressure combustion stroke, letting some gases reaching the low pressure side of the engine.

A broken "oil sweeper" might still be in place, even in two or three pieces and do its job together with a nice ticking.

Anyway, at this stage, all can only be conjecture and the best solution would be to open for autopsy ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

A broken ring, will score the cylinder. it would still show compression but only for a while.
The engine will start burning oil....a lot of it.

The oil ring might not score the cylinder (not as fast or as bad).. but then it will still burn oil.


Now a compression test might lie a little but a leak down test will show broken rings.
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Old 05-05-2019   #15
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Re: Gasoline smell in oil

I can make compression test, and also wet test. If I measure higher pressure on wet test morecthan 20%, it can be proof that theres leakage throug piston rings right?
And if I measure the same results after dry and wet test, and on one of cylinders I measure lower pressure by both tests, that means that there is leaking through one of valves right?
And if this happen, I can do leakdown test - but here I'd like to ask you what to use to make constant pressure into cylinder? I have no tools, no garage...
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Last edited by Rado77; 05-05-2019 at 12:07.
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