Can I take the engine oil (lubricating oil) for car maintenance on the high-speed rail?

Yes, automobile oil has not been banned.

"Railway passenger transport regulations" has corresponding provisions:

Article 52 The following items shall not be brought into the car:

Articles whose transportation is prohibited or restricted by the state; Dangerous goods, ammunition and chemicals whose nature cannot be determined by the laws, regulations and rules; Animals and articles that hinder public health; Articles that may damage or pollute the vehicle.

In order to facilitate the travel life of passengers, you can carry no more than 20 ml of nail polish, gloss remover and hair dye. Do not exceed 100 ml of alcohol and cold perm essence. No more than 120ml of mousse, hair gel, sanitary insecticide and air freshener.

Extended data:

Article 53 of the Regulations on Railway Passenger Transport stipulates that:

Passengers carrying articles in violation of regulations shall be handled in accordance with the following provisions:

1. It is forbidden to get on the bus at the departure station.

2. When getting on the bus or getting off the bus, for the goods exceeding the free weight, four types of parcel freight should be charged for the overweight part. For the undivided whole overweight, oversized articles and animals, the freight for the four packages from the upper station to the lower station shall be paid according to the total weight of the packages.

3. If dangerous goods or articles prohibited or restricted by the state, articles that hinder public health, and articles that damage or pollute vehicles are found, the freight for the four types of packages from the bus station to the next station shall be doubled according to the total weight of the articles. Dangerous goods shall be handled by the front parking station; If necessary, hand it over to the public security department for handling. Dangerous goods that need to be destroyed on the spot shall be destroyed on the spot so that they cannot be harmed and will not bear any liability for compensation.

When confiscating dangerous goods, a written certificate shall be issued to the confiscated person.

4. If the value of overweight and oversized articles is lower than the freight, the freight can be charged at 50% of the value of the articles.

5. When collecting freight, it shall not exceed the departure station and terminal of this train.

Railway Customer Service Center-Railway Passenger Transport Rules