something like turkey baster would work, we have an automotive type (rubber bulb w/tube) that we use to suck brake fluid and/or PS and other fluids when necessary. As little as they cost I myself would replace the plugs, some of them do have a tiny hole in the center, I assume they are original and remember its a rubber product that is ten years old. The fleet of school buses I run we use 50W syn oil in the hubs, double check your chassis manual, 75/90 won't hurt any thing, we just use that for differentials.
Rick & Becky FMCA F449582 WIT167153
2005 Winnebago Journey 36G, Cat C7/350
2010 CR-V toad, Roadmaster Falcon 2