I found the following whilst having a sticky beak on the official Toyota web-site:
Can I have my Toyota serviced by an independent/non Authorised repairer?
While any reputable mechanic will do their best to service your Toyota for safe driving, the best way to be 100% sure your Toyota is serviced correctly is to trust it to the expert Technicians at your Toyota Service Centre. With their sophisticated diagnostic equipment, Toyota specific training, authorisation to conduct repairs under warranty, and use of Toyota Genuine Parts, you can be sure your Toyota is in the best of hands. The Toyota new car warranty may not cover claims or damages caused by the failure of non-genuine parts used by some vehicle repairers.
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Is this a yes or a no? I am a non practicing but certified A grade mechanic but the better half is to scared to let me service her corolla untill warranty expires.
Even I can still manage an oil change & inspection better than a spotty apprentice.
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If I have my vehicle serviced by someone other than a Toyota Dealer, will this void my warranty?
If a licensed vehicle repairer
services your Toyota vehicle in accordance with Toyota's servicing guidelines, then normal warranty coverage will apply.
It is however important to note that if a non-genuine part is fitted to your Toyota and that part's failure or the incorrect fitment damages your vehicle, then that damage may not be covered by your Toyota Warranty.
For peace of mind servicing, we recommend you visit your authorised Toyota Service Centre who uses Toyota Genuine Parts and has Toyota trained technicians.
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I will take this as a qualified yes.
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Will the Toyota Warranty become void if I modify my car?
Toyota Warranty will continue to apply to original components of the vehicle providing they have not been altered from the manufacturer's specification or impacted by the modifications. Also, the Toyota Warranty will continue to apply if your vehicle is fitted with Toyota Genuine Parts and Accessories. However, any damage resulting from non-genuine modifications will not be covered.
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Not sure about this one, maybe a no.
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Not sure, Eddy