Sorry if this has been discussed previously, but - I have a 2018 Honda, the maintenance minder is telling me to replace transmission fluid, rear differential fluid, brake fluid, spark plugs, and inspect valve clearance. Several non-dealership mechanics have told me they don't need to be changed unless there's a problem (except for the valve clearance, on that point the mechanics told me they don't do that, so they're not weighing in) - what are your thoughts/experiences?