Step six: making the choice of oil

In essence, after steps four and five, all that's left for us is to pick an engine oil from among several brands from various manufacturers.

Choosing the engine oil manufacturer is a matter of faith; the only thing I can advise here is to keep in mind that whatever sells in bulk gets counterfeited the most aggressively, so the odds of buying genuine engine oil of a popular brand within the CIS are fairly low. And if you buy a fake, everything written on this site becomes meaningless, because the chemical composition of a counterfeit oil can't be analysed or systematised.

When it comes to deciding which oil to put in the engine, personally I always try to pick the engine oil (manufacturer) that's used on the assembly line when the car is built, though that's usually far from the cheapest option. Since the quality of any given manufacturer's product can shift quite a bit over time and depending on the market it's being supplied to, I think it makes sense to read current reviews and pick whatever is currently considered the highest quality.

On top of that, if you have a bit of time, read the manufacturers' official notes for the engine oil brands still left on your list — there may well be further comments there about operating conditions, letting you pick the one that best suits you personally.