Why does the oil in a diesel engine darken immediately

In this video we conducted our experiment to answer uncomfortable questions from customers
A common issue is that many customers, after having their diesel engine oil changed, ask the question: "You changed my oil, so why is it so black?" This can lead to a lot of inconvenience and mistrust, requiring a thorough explanation and even showing the work of the mechanic on surveillance cameras
I hope you liked the video and found it useful. If you didn’t say something, leave comments and subscribe to our channel
#mechanic #mechanicalengineering #carrepair

[@bepacman]

Great explanation but i would have to differ with you on the reason. While you are correct of all of the oil properties, you are correct about the dieselengine compression being higher and you are correct about the soot; the reason is not clear. The true reason and taking in count the above is that when you start the engine in the morning the components like the piston rings are not at operating temperatures, they are cold, this allows combustion by product (soot) during the power stroke to go by the piston rings and in to the oil sump making the oil dark almost since the firat time you start the engine with new oil. After operating for some minutes, the piston rings expand and creat a better seal in the combustion chamber therefore combustion byproduct will not enter the oil sump. The cause is thermal expansion. Good video.

[@opelservicekyiv]

Thank you so much for watching and sharing your thoughts. It adds to the treasury of our ideas and knowledge 👍

[@Simon-dm8zv]

But the same thermal expansion happens in petrol engines right?

[@bepacman]

@Simon-dm8zv Yes, but the petrol engines inefficiency makes it warm up faster, and combustion happens more rapidly, heating all elements quicker making piston rings seal faster, I would not define combustion as cleaner on the petrol engine but it does not have the amount of soot generated in the compression fired Diesel engine, unless excess petrol is being burnt but even then, but even then its not as much soot as diesel. Both combustion processes are completely different but do the same work, rotate the crankshaft.

[@Simon-dm8zv]

@@bepacman That makes sense. Thanks!

[@oztint6032]

Great video, i really like this channel because of your practical experiments, love from mexico guys.

[@opelservicekyiv]

Thanks a lot. We are pleased. Hello from Ukraine.

[@CC-zm9fw]

Great video, especially the comparison of 3 different oils' colour on the paper towels. However, you didn't get much use out of the transparent sump after all the effort of making it. Please could you do a video of the transparent sump with the engine running at different speeds (and also measure how many mm the oil level drops when the engine starts, and when the engine is running at higher rpm)?

[@opelservicekyiv]

Thank you, I'll add it to my list of things to do. Then we will select a suitable car and material. It turned out that the review is not available everywhere.

[@nagyba]

Great video by car mechanic 🎉

[@opelservicekyiv]

Thank you

[@Trammael]

Thanks for explanation

[@opelservicekyiv]

You're welcome

[@realpremier]

Great video!

[@opelservicekyiv]

Thank you

[@Biimer]

Thank you!!

[@opelservicekyiv]

You're welcome. Thank you for rating the video 😀

[@user-kn5cm6sz2y]

Are there any approved mechanical courses?

[@opelservicekyiv]

There are educational institutions, but I can’t tell you about courses. Thank you

[@user-kn5cm6sz2y]

And what because I don't know him

[@Paul-zz1cr]

Can never waste water . Unless you take it of the planet. Same water that's been here for millions of years

[@suzuki182]

Май инглишиз вэри бэд🤷‍♂️.
Плиз спик он юкрейн анд рашн туу.🤝
Фэнкью вери мач🙂.

[@opelservicekyiv]

Окей друг 👍😀

[@user-eg3gr3td3u]

Доброго дня, ви в Києві працюєте, чи вже ні?

[@opelservicekyiv]

Добрий день, працюємо з 9 до 18, крім неділі

[@user-eg3gr3td3u]

@@opelservicekyiv підкажіть будь ласка, дизель 1.5 на 90квт на Астрі 20 року можна розглядати до покупки з пробігом 130тис. Км.

[@yaragundlarajesh8616]

Hi, my car has been completely submerged under water for 10days, post i didn't started and given to service center.
Can you please tell me whether my car works?

[@opelservicekyiv]

Engine may need repair

[@yaragundlarajesh8616]

@@opelservicekyiv what about the electrical components like ECM,and another remaining main modules sir?
Can you please tell whether repair is enough or replacement is necessary?

[@opelservicekyiv]

@@yaragundlarajesh8616 You need to assess the condition; some things can be repaired, while others cannot. Disassemble the unit and inspect

[@yaragundlarajesh8616]

@@opelservicekyiv Thank you so much for your response

[@rihardokl1447]

Отлично! Моя Astra K 1.5 crdi универсал шумит очень сильно в задней части. Резину поменял. Что можно сделать дополнительное чтобы так не шумило. Раньше имел Astra G и было на много лучше. Почему столо хуже. Дякую!

[@opelservicekyiv]

Может быть проблема в ступичных подшипниках. Потрібно слухати.

[@AlexeyRybkin]

Хорошее

[@opelservicekyiv]

Спасибо

[@williamdgmartin]

Isn't there a war in Kyiv?

[@williamdgmartin]

Is it not affecting you?

[@werblee]

Привет

[@opelservicekyiv]

Привет

[@aciddiver1978]

Better having gas car.

[@realpremier]

Depends for what use ;)

[@CarChoice777]

Надо раз в 5-7000 масло менять!

[@1mandanceparty]

You guys ever work on a calibra dtm touring car? 👀👀👀
🇺🇦🫡

[@opelservicekyiv]

Calibra didn't stop by