My dad just freaked because he called from work and told my brother that our lawnmower is two-stroke and to buy oil for it and then mow the lawn. So my brother and I drive to the store and buy two-stroke engine oil and put it in our lawnmower . As soon as we are finished putting the oil in my dad calls again and says he thinks it's four-stroke and then freaks out when I tell him we already put the oil in. Here are my questions. How many lawnmowers are fourstroke?(our lawnmower is a Sears one that is at least 11 years old) Would it matter if you put 2-stroke oil into a 4-stroke mower? How much ram does my mower need to run Fallout 2? Thanks.