If the oil is not depleted, even a synthetic funnel, the engine will work longer, when he drinks a little bit of a semi-synthetic, when he drinks oil like a drunkard, the cheapest mineral funnel, such an engine will not be helped anymore, and it is a pity to refill expensive oil.
In general, this engine is durable and the design is simple, so it will work even on a mineral one, but in winter for a good start it is better to have a lower density oil, that is, semi-synthetic.
Even if you don't know what's wrong, don't be afraid to change the oil grade, because it won't hurt the engine, today oils do not damage the seals and are miscible, the rest are unconfirmed stereotypes. To be sure, you can do a rinse and then pour in better oil, if the engine is not using it.