They differ because very different requirements are placed on them. First, motorcycle engines are often more overpowered (high power from small capacity) and run at higher rpm than car engines. Second, in almost all motorcycles, engine oil also works in the gearbox and clutch. Car engine oils are not suitable for motorcycles because they may contain additives that reduce friction and cause clutch slippage.lej silnikowy pracuje również w skrzyni biegów i sprzęgle. Oleje do silników samochodowych nie nadają się do motocykli, ponieważ mogą zawierać dodatki uszlachetniające, które zmniejszają tarcie i powodują ślizganie się sprzęgła.

A very high quality mineral oil can perform better than a synthetic oil like itself. Top-quality synthetic oils, on the other hand, can be more thermally stressed, age more slowly and keep the engine cleaner and better protect against wear.

Yes. Only that the properties of such a mixture go in the direction of oil with inferior properties. But topping up rather as a last resort - it is better to add inferior oil than to drive with too low an oil level.

No, because, for example, when new oil turns brown shortly after a change, it only proves that it is doing its job (trapping dirt and preventing deposits). During the change, there will always be some old oil left in the engine, which will immediately color it dark.

Yes. Any oil that comes into contact with oxygen will age, but for fresh oil a year without work is no problem. That's why a change can be done in the fall. Fresh oil - kept in a sealed bubble, unaffected by frost - can be stored for up to 3 years in rooms where UV radiation does not reach.

This is better, because the engine oil works better from about +500C. Nevertheless, everything works properly once the operating temperature is reached. It makes sense, therefore, to warm up the engine a bit.