Indeed I did. Thanks for the correction!
The dipstick says 10-30, the book says 40 weight for 85 degree plus temperatures, which will be here next week.
Not sure what my dipstick says but I thought mine said 30W... but the engine manual says what the above member is saying. A range from 32 to about 95F or so. Its on a chart so a little hard to tell but it goes above the 86 degree mark on that chart to about 35 degrees Centigrade which would be 95 degrees. And it also says in a little note that using multi grade oils will increase Oil consumption and to check the level often when using them.
Added on edit: My dipstick actually says both! First is 30 then there is a space and it then says 10 - 30.
I did learn a trick to putting the deck belt back on today. Maybe something known but the guy that answered the phone at my dealer today didn't suggest it. He just said it was tricky and you just need to keep trying. He also said it was easier with two people. Sure... isn't everything? My helper is 5 years old. So not much good advice.
But here it is
Reroute the lose belt onto ALL the deck pullies. Not on the motor pulley. Leave it off that for now.
Drop the deck down and lay on the left side.
Take a 2 foot long pry bar and place it between the deck stud (you'll see it right in front of that rear idler pulley, the one without the spring attached to it) and the idler pulley, laying the pry bar right onto the belt that's already in the idler pulley's groove. All belts up on the deck should be in their groves.
Pry back and over the primary pulley and keep going past the ear that holds the bolt that fastens the Belt cover down. I removed the plastic nut for this. And carefully rest your pry bar behind that ear and bolt. So it jams in there and the tension of the idler spring holds it in place.
Now move to the rear of the mower and take a short (4-6 inch) screw driver ( I used a punch and probably a Phillips head would be best) and line up the belt to the rear (motor) pulley best you can and use your screwdriver (or some such short tool) and pry the last little bit of belt onto the pulley. You'll hear you pry bar drop out as the tension goes off of it as the belt goes on. No problem. Now wiggle your screw driver or punch out and presto. Your done.
Worked for me.