1.16.3. Oil

Oil change is usually made in a binding to a car run, but not by a season. But as change oil on average time in half a year why not to make it in anticipation of winter?

The vast majority of modern engine oils – in a varying degree – all-weather. It is considered that it is necessary to fill in what is offered the producer in the maintenance instruction of the car. But winters happen different – both slushy and warm, and vigorous and frosty. Also it is not clear at all whether the producer assumed that its car will be operated in the conditions of the Russian winter and that oil will be required to it "more cold".

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

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

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

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

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

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