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Engine oil for auto

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Physical and chemical properties

Motor oil is a technical liquid in the car engine lubricating system. It lowers friction of power unit parts, due to which its lifetime limit increases, operation efficiency improves and fuel consumption is reduced. It promotes cooling of engine components, cleans them from dirt and carbon deposit, protects against corrosion.

Engine oils classification

  1. SAE. It is based on viscosity characteristics of oils at different temperatures. It is developed by the community of motor transport engineers SAE International. Due to this classification, all lubrication materials can be divided into winter, summer and all-season ones.
  2. API. According to the classification of American Petroleum Institute, all lubrication materials can be divided into the following groups: S – for petrol power units, C and F – for diesel ones. According to engine features, each of them is divided into service categories also marked with letters. Products of SN, CK-4 and FA-4 service categories comply with the latest requirements.
  3. ACEA. European Automobile Manufacturers Association distinguish 3 categories of lubricants according to operation characteristics:
    1. А/В. For diesel and petrol engines of different configurations.
    2. C. For new power units with catalysts or particulate filters.
    3. E. For diesel engines of cargo vehicles and special vehicles.

Types of motor oils according to composition

In classifying basic oils for power units, American Petroleum Institute takes into account not only their composition but also manufacturing technique, thus dividing all products into 5 groups:

  1. Products made by petroleum distillation without additional treatment.
  2. Petroleum distillates which underwent additional refinery.
  3. Petroleum distillates made by the method of structured refinery with preliminary multiple hydrocracking using hydrogen.
  4. Short-chain polyalphaolefins made by chemical synthesis.
  5. Chemically synthesized polyether-based products.

More common classification involves division of all products according to composition into 3 groups:

  1. Mineral. They include lubricants based on I and II groups according to API. They are inexpensive and fit engines with high mileage well.
  2. Semi-synthetic. Their composition includes no less than 25% of III, IV or V group oils. They are more effective than mineral ones, and cheaper than synthetic.
  3. Synthetic. Their composition includes no less than 30% of III, IV or V group products. They have an extended replacement interval and dissolve additives well.

Buycarparts.co.uk: high quality oils for your car

You will find more that 2,000 car oils of 13 brands in our online-shop. Motul, Liqui Moly, Castrol, Febi Bilstein, Startol, Vaico, Swag, Elf, Aral are among the most popular manufacturers. Due to numerous promotions and discounts, here you can buy motor oils at the most affordable price.

Note: replacement of oil should be performed at a service station.

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ratings and reviews

Good product for good price. Well packed.


fantastic delivery. not anticipated for a week , arrived in 3 days.

Frequently asked questions
Brake Disc
  • P.J. 2020-11-09
  • Hello, do these break discs have their bearings? Do they fit my Peugoet 307 hdi 2.0 diesel 2003? Also need ABS sensors if possible? Thank you

Transmission Oil
  • T. 2020-09-20
  • Hi, I have an 2009 Automatic Mercedes Benz Sprinter 311 CDI 906 133 Diesel. Can you tell me if this Item is compatible with my Camper van? thanks

Coil Spring
  • R.S. 2020-09-15
  • looking for front suspension springs for suzuki grand vitara 2005 model 16v se 1590cc petrol VIN - JSAFTB03V00XXXXXX

Seal Optimizer
  • K. 2020-09-09
  • Hi, I am going to order few parts for my vw POLO 1.3 CL COUPE. I need: 1-Carburettor Flange 2-Carburettor Flange seal 3- exhaust system seal. Can you find the correct replacements for my car, please? thank you

  • M.S. 2020-09-07
  • Article №: 20-3431-05-2 Article №: 20-3432-05-2 Are these headlights for right hand drive car? Thanks

Hydraulic Pump, steering system
  • H. 2020-09-06
  • I have supplied the reg number of the vehicle but cannot see the OEM number of the power steering pump, will the reg number be sufficient ?

V-Ribbed Belts
  • P. 2020-08-26
  • Hello - my car Mazda 2, TS 1.3 petrol. I need drive belt replacing. Can you suggest right one please?

Wheel covers
  • P.M. 2020-08-17
  • do you have the dimension of the very centre circle of these covers?

Inner Wing Panel
  • M. 2020-06-29
  • Does this PRASCO Inner Wing Panel Left (Article №: PG4223604) fit for my Peugeot 307 SW? Also, Right Front panel? Thanks.

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