Needed maintenance five-year-old Speed Queen washer
Other than just keeping the outside clean, wiping it off, inspect the inlet hoses if you'd like, looking for soft spots and bulges.
My Speed Queen front loader turns 20 years old sometime this year I've done absolutely nothing to it other than just wiping it off, washing machines do not require maintenance Unless they are in extreme use situations.
If this was a jet airplane that your life depended on, I could give you a whole list of things that you could do to it, but it would be time-consuming and expensive, replacing the outer tub seal, for example, is a huge job on this machine not worth doing because so very few of them fail in the first place. Keep in mind that anything you do to this washer may actually make it less reliable unless you are expert and do a fantastic job. You're more likely to cause problems, even as an experience tech nothing is ever any better after I work on it if I've done my job perfectly it's as good as it was when it left the factory, however, when you're repairing things in a home environment, you do not have the advantage of the great quality control that the machine had when it was being assembled at the factory and inspected at every step of the way.
You didn't mention how many loads a week you're doing, but that would be helpful
John L