How to choose engine oil: viscosity and approvals

How to choose motor oil when there are dozens of brands and designations on the shelf? The answer is easier than it seems. Two things are important - viscosity and the approval of the car manufacturer. In this article we will explain both.

What does 5W30, 5W40 and 10W40 mean?

The number before the W (from winter) indicates the behavior of the oil in cold weather. The smaller it is, the faster the oil reaches the engine parts during a cold start. The number after the W indicates the viscosity at operating temperature. Therefore, 5W30 is thinner in cold weather than 10W40 and thinner at operating temperature than 5W40.

Endorsements are more important than the brand

Car manufacturers issue their own standards - for example VW 504.00/507.00, BMW Longlife-04 or MB 229.51. An engine designed for low ash (Low SAPS) oil will have problems with the DPF filter if you use the wrong oil. So always check the service book.

How to choose engine oil according to the engine

• Modern diesel and gasoline engines with DPF - most often motor oil 5W30 with ACEA C3 standard.
• Engines without strict requirements - the universal engine oil 5W40.
• Older engines with high mileage - semi-synthetic oil 10W40.
• Old engines and equipment - the mineral oil 15W40.

How often to change the oil

With normal driving, the interval is between 10,000 and 15,000 km or once a year. City driving, short trips and gas systems put more strain on the oil - then it is better to have a shorter interval. Always change the oil filter along with the oil.

Brands you can trust

At Autoport.bg we offer original oils from Castrol, Mannol, Motul and Total Quartz, as well as original BMW and Mercedes-Benz oils. All products are from official importers. Detailed technical data for ACEA standards can be found on the website of ACEA.

Frequently asked questions

Can I mix different oils? When topping up, it is permissible if the viscosity and approval match, but it is best to use the same oil. Is synthetic better? Not always - it is important that it meets the requirements of the engine.

How to check the oil level

Park on a level surface and wait a few minutes after turning off the engine. Remove the dipstick, wipe it, reinsert it, and remove it. The level should be between the two marks. If it is near the lower mark, add the same oil in small amounts and check again.

Increased oil consumption is a signal to have the engine checked at a service center. Normal consumption for a modern engine is up to about 0.5 liters per 1000 km, according to the manufacturer's instructions.

Conclusion

How to choose engine oil? Check the service book, select the viscosity and approval, and then the brand. If you have any doubts, write to us - we will help you choose the right oil. Orders are delivered with Econt and BOX NOW.