Visiting the Parts department at the local Toyota dealer made me wary of the brand many years ago. The Parts departments at the local Honda dealers I had cause to visit were always well-run and some of the folks were exceptionally helpful. By comparison going to the dealer to get parts for my ex-wife’s Toyota was positively nasty.
Last time I visited PhilipG’s page on the Toyota Sienna, he was very positive on the brand and his (then-new) car. Seems his experience since then is less pleasant, and from the comments he has a lot of unhappy company.
So perhaps a good litmus test is to try out the dealer’s Parts department before buying a car?