Just bought a 2005 Glastron SX 195 with a 5.0 GL Volva-Penta. I want to change the oil, as previous owner did not change it at end of last season. My question is what type of oil to use, synthetic or regular, what weight?. The engine has a 30wt synthetic label from factory. However, I don't know if previous owner used synthetic or regular. What type of pump do I need to get the old oil out? Thanks for any help.