I have a (what may be stupid) question... I tried to search the boards, but got so many hits I couldn't narrow it down to find my answer, so I apologize in advance if it's been answered to death.<br /><br />I'm new at this boat stuff! I purchased a Nissan 4 stroke 5 HP outboard motor (with a 12' PortaBote). Neat stuff!<br /><br />In the manual, it states that the oil that I need to use is:<br /><br />SAE 10W-30/40 - (SF, SG, SH, SG)<br /><br />What is (SF, SG, SH, SG)? Can I just use oil in that viscoscity range that I can get at any gas station? Or is there some "special" oil that I need to get at a marina or something?