I have this and it's not a true quick-release like common ratchets they take a 1/4 socket holder that comes out with the socket, not for any torque above 5 or so lbs. A specialty tool for sure not an everyday all day tool
Pennzoil {PYB conventional} 30W or 10W-30 change it often at first like after the first tank of gas then every other for 3 quarts of oil. This will flush out the break in ware metals, oil is cheap, and this engine doesn't hold a lot.
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The housing and shafts look like they are pitted meaning they won't hold anything close to liquid and grease is your only hope. Adding a grease fitting and cleaning up all the parts might get you through a few more winters if you add grease often like after every use to force out any water that...
Get an SSD! I have an ancient laptop {2015 eara} with an AMD A6 that is running Win10pro just fine. Just get an SSD and at least 8 gigs of memory and it will be a LOT faster