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I just don’t pil change, it might show a little high, then you run the motor to cycle it through the system then it levels out. Good enough. A little less or extra doesn’t hurt anything.
Source: not a mechanic, but I know a lot of them and I’ve never taken my personal vehicle in for a change in 25 years.
Usually this is handled by the access points. If you’re running dual band (2.4GHz and 5GHz) you will get worse strength out of 5, typically, since it doesn’t go as far or penetrate as well as 2.4. The access points will try to kick a client to another, better quality access point if they’re smart enough. This is generally how business access points work. You might want to see if whatever ones you’re using support this. Also it’s best if they are both the same SSID, in case they are not.