Question from the forum “Behind the wheel” – we answer them from time to time.
– Can I add a more viscous, say, 10W-40 instead of the recommended 0W-20 engine oil in the summer?
– No, you don’t have to. The temperature of the engine does not depend on the time of year: it is always approximately the same. And the throughput of oil channels does not increase in the summer. Therefore, a more viscous oil can roughly “get stuck” in it – with all the consequences that entails. It’s not a fact that this will definitely happen, but it’s still not worth risking the engine. It is no coincidence that the manufacturer recommends the “twenty”, even if it resembles water in consistency.
Indeed, modern engines have small gaps between the work surfaces and narrower oil passages – full viscosity oil will not penetrate everywhere. That’s why in engines not older than three years and not lower than emission class 4, it is usually recommended to top up with low viscosity oils.
BUT! Low viscosity oils such as 0W-20, recommended for most modern engines, are not suitable for older and heavily worn engines.
On older engines, the gaps between the parts are larger than on modern ones. This means that only high viscosity oils can form an oil wedge in the crankshaft bearings of these engines. If you “don’t guess” with viscosity, you may run into an engine overhaul.
Low viscosity oil is also not suitable for worn engines: oil will simply flow out through larger openings and the oil pump will not be able to create the necessary pressure as the oil heats up.
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Source: Z R