I change my engine oil/filter every 5000miles. I usually suck out between 5.5l and 6.0l depending if I change the filter. Tonight I sucked out 7ltrs....
Where has the extra come from? Fuel dilution? I’m pretty relaxed sitting here right now as the level is spot on and oil is all fresh but any thoughts would be great.
Mileage is done mostly on the M40 by SWMBO.
10th Oct 2022 6:51 pm
NC500
Member Since: 18 Sep 2017
Location: On the NC500
Posts: 541
Send a sample of oil off for analysis - it’s the only way to know for sure.
At 5000 mile intervals you should only expect 1.5% fuel dilution
11th Oct 2022 7:37 am
Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
could be fuel injector dripping/leaking
11th Oct 2022 11:54 am
motorworks
Member Since: 14 Nov 2019
Location: Usk
Posts: 412
I bought a 65k miles Jaguar XF, 3.0L, with thick fuel vapour from the exhaust at tick over, virtually no throttle response. Also, a failed turbo, sure to be fuel in the engine oil.
Only vague history, but I was told that the problem originated from contaminated fuel. Two faulty injectors but the main problem is elsewhere in the fuel system.Chris
Send a sample of oil off for analysis - it’s the only way to know for sure.
At 5000 mile intervals you should only expect 1.5% fuel dilution
Keen to do this - any recommendations where to contact?
11th Oct 2022 6:05 pm
s60r
Member Since: 14 Mar 2021
Location: West Sussex
Posts: 287
Also may be worth considering failed or incomplete DPF regenerations?
Ford engines are well known for this.... I'm sure its the same for all DPF equipped engines.
In the wisdom of car makers they have not added a light or warning as to when a regeneration is taking place.... the driver then unwittingly turns the car off as they have finished their journey.
If a regen was taking place and didn't complete the unburned fuel is returned to the sump! A terrible idea but they all do it.
It only takes 2 or 3 regens to not complete and the oil will be over full.
Just worth considering. Especially as Ford are well involved in the development of our Disco's!
So if your oil is examined and contaminated with diesel it isn't alway "a fault".... just crap design!!A mod a week until I have nothing to improve or add.
11th Oct 2022 6:44 pm
NC500
Member Since: 18 Sep 2017
Location: On the NC500
Posts: 541
Millers oils - I always send of a sample of my oil for analysis to them. Turn it around in about 5 working days
11th Oct 2022 8:25 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
At low speed the DPF regeneration is cutback to avoid excessive heating due to lack of airflow. There will not be extra fuelling at shutdown.
Most of the extra dilution of oil is due to cylinder-wash from fuel condensing on cylinder walls that are not at full operating temperature - even a failed FBH can cause additional dilution effect, as well as the obvious things such as faulty glow-plugs
If the injector nozzles are producing only a partially atomised fuel charge then this can also cause additional wash effect but you also tend to get other symptoms of poor performance and smoke. A nozzle itself leaking is rare but has been known on shutdown. The amount is tiny but the engine makes a different sound on ignition off and the engine is hot.Land Rover - Turning Drivers into Mechanics Since 1948
A bit embarrassing to admit it but in the spirit of thread conclusion, I have found the reason for an increase in the volume of old engine oil removed from my sump.
There is nothing wrong with my car. I have been collecting the warm/hot sucked out oil in a used 10ltr adblue container (container side marked by me in 1ltr graduations). The container has over time changed its shape probably due to the oil warmth/heat meaning that the quantity markings became useless. These containers are probably ok for one or two use’s.
Sorry. This thread has not added anything to the pool of knowledge on the forum and just only shows that what my wife says about me is correct.
15th Jan 2023 7:27 pm
sub
Member Since: 04 Jul 2022
Location: Cheshire
Posts: 99
I for one have learned a lesson, so thanks for letting us know your conclusions!
15th Jan 2023 8:00 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8226
My wife once asked me how much oil does her Mini need as she had already put 5 litres in the engine and it still was not full? It can when others can't,
It will when others won't,
It goes where others don't.
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