Lumax Black LX-1632 15 Quart Drainmaster Pan and Waste Storage. Ideal for Oil Recycling, Drain Direct-No Oily Tub, Funnel, Mess to Clean-Up on Top or Side https://www.amazon.com/dp/B0059HJSA2/ref=cm_sw_r_apan_glt_fabc_JQ68AC32XZ7CMW69K8ND?_encoding=UTF8&psc=1
Ive used one like this for years. No mess as long as you aim it correctly and can take it right to the autoshop to dump.
Snag a low profile oil drain pan with spout for easy draining. My drain tube on the generac is close to the ground so the lower sidewall helps out a lot. I end up using Mobil1 oil as its cheap to buy in gallon jugs at wallyworld.
This is similar to what I use: https://smile.amazon.com/Lumax-LX-1632-Black-Drainmaster-Storage/dp/B0059HJSA2/ref=sr\_1\_5?crid=25P2BA2HCV0EK&keywords=low+profile+oil+drain+pan&qid=1640371780&sprefix=low+profile+oil+drain+pan%2Caps%2C98&sr=8-5
something like that, only maybe smaller. I got one at AutoZone for like 10 bucks.
Get yourself a Drainmaster oil pan.