"Bob, I sold my AQ130 about 3
"Bob, I sold my AQ130 about 3 years ago, but I have been using occasionally SAE 10W-40 and mostly SAE 15W-40 in all Volvo-GM-Ford marine engines I have owned. The reason for me not using SAE 10W-30 is to prevent the oil pressure from dropping too much (especially at lower RPM) when the engine has been running hard.
You can certainly use monograde 30W with no adverse effects. The only difference is that it may be a bit harder for the starter to crank the engine in cold weather."