S-class W202 Mercedes

1993-2000 of release

Repair and car operation

The vast majority of modern engine oils – to some extent – all-weather. It is considered, it is necessary what to fill in that is offered the producer in the car maintenance instruction. But winters happen different – both slushy and warm, and yadreno-frosty. And it is absolutely not clear, whether the producer assumed that his car will be maintained in the conditions of the Russian winter, and that oil is required to it "more cold".

If you decided to deviate the instruction, at a choice of oil it is possible to use simple reception of determination of its temperature suitability – for secure. Let's call this reception by "rule 35".

Marking of engine oil should include designation of a class of its viscosity on SAE scale. For example: 15W-40. It means that this oil on viscosity at minus temperatures meets the requirements shown to winter oils of a class 15W, and at the plusovy – to summer oils of a class 40.

Remember number 35. If from it to subtract a "winter" index of a class of viscosity, in our example it is 15, the size called by limiting temperature of a prokachivayemost, i.e. temperature at which oil still keeps fluidity will turn out.

35-15= 20. Means, oil 15W-40 can use at temperatures to–20 ° C.

Respectively, than less "winter" index of a class of viscosity, subjects oil is colder". 10W – to–25 ° C; 5W – to–30 ° C.

It also is "rule 35". Simple and useful.