Thats an emulsion made up of oil vapour and water vapour (like mayonnaise) which typically happens when the car is used for lots of short journeys as it never gets hot enough to 'burn off' all the moisture in the engine. The solution is usually a good long run to get everything hot and keep it hot for a while. Ideally an hour or more on a motorway will do it as the engine needs to be under load to generate enough heat, although if its -18 where you are that might be tricky to achieve?
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