I'm looking to change the oil on my new to mST1300. Before I posted this I spent hours scouring this new to me forum looking for answers to my questions, as not to be "that guy" No luck, here it goes and forgive me in advance. What is the recommended oil viscosity for the ST1300, what oils do the majority use? Is there a synthetic oil and recommendation?What is the oil quantity? 4 quarts plus a filter? What filter? Thanks