I used to have good luck on other engines using Varsol to thin the oil/water "milkshake".
I use the Pella 6000 suction oil extractor:
https://www.amazon.com/Pela-PL-6000-.../dp/B002EJ2GUC
You can remove the small dipstick tube and use the larger diameter hose. I found that it just fits inside of the hose that connects my aftermarket oil filter to the large plug on the crankcase.