it always took me a few attempts to start my sienna 2000 (130k mi). so I have battery replaced (it was about 12.3v). it went well the same day. the next day I failed to start it again (again, no cranks, took another few attempts to get it started). thought it was parasitics drain, so after one successful use of the car, I disconnected the battery, so its voltage is kept around 12.6v. the next day, still took a few attempts to get it started. no cranks. so my question is: something wrong with the starter? what part of the starter? it is hard to start, and potentially leaking (since I have battery disconnect during the night, parasitics drain issue can be excluded. I've also measure resistance along the path (from battery + terminal to starter solenoid, the resistance is almost negligible))
Update: here is what I do these days: disconnect the battery at evening to prevent overnight drain. connect in the morning. try 2~3 minutes to start the car (no cranks), it will eventually start, and voltage is ~14v when car is running.