hey guys, I’m new here. I don’t normally work on big boats. I helped a guy out for free. He has a 1988 34 Sea Ray with carbed 454 mercs. One engine wouldn’t start. Changed the fuel pump, rebuilt carb and put a rebuilt starter on. It’s all good now. My question, I changed the oil for him too. I read 6 to 7 quarts with filter? I sucked the oil out. New filter, put about almost 5 quarts in and it looked above the full line. I ended up putting 6 quarts in. The other motor a little less. Both looked over full on the stick. I went to suck some out and the owner insisted on leaving it. Should I trust the stick? Is 5 quarts normal? I raised and lowered the boat on the lift to try and suck it all out st first. Also got the boat level for checking the stick. Thanks for your thoughts.