I don't know how it is with Toyota, pero with Mitsu's Diamond Motors, they encourage you to have everything done in-house. Kahit sa kanila na yung labor, ni ayaw nilang magdala ka ng sarili mong mga piyesa, even if they're genuine parts; they slap a 20% surcharge on parts brought by the customer, and they offer no labor warranty on the installation of those parts. Gusto nila sa kanila mo na bibilhin yung piyesa.
So for the duration of my vehicle's warranty, kadalasan yung pagpalit (oil change, fuel/air filter change) sa Shell ko pinapagawa, with Banawe-bought parts. Ball joint replacement, sa Goodyear Servitek, with components bought from El Dorado. Aircon cleaning, courtesy of Mang Mario, way more affordable. All in all, PMS lang talaga ang pinupuntahan ko sa casa. Once lang ako naka-miss, on my 30,000km PMS; nagpa-home service na lang ako dun sa kakilala naming Mitsubishi mechanic.
My warranty's expiring by the end of the month, so I'm now free to explore other shops for my future maintenance schedules.