No big deal. We all goof up once in a while.
This forum is more about foreign oils and their specs than about foreign vehicles themselves, although if you need an oil with foreign specs, then it's probably because you have a foreign car in the first place.
Toyota doesn't seem to be too fussy about oil specs in the US, regardless where the vehicle was made/designed.
Once again, 500k miles is quite impressive, IMO.
The STP additive that you mentioned - is it a fuel additive or an oil additive? Have you noticed the car runs poorly if you don't use the additive?
This forum is more about foreign oils and their specs than about foreign vehicles themselves, although if you need an oil with foreign specs, then it's probably because you have a foreign car in the first place.
Toyota doesn't seem to be too fussy about oil specs in the US, regardless where the vehicle was made/designed.
Once again, 500k miles is quite impressive, IMO.
The STP additive that you mentioned - is it a fuel additive or an oil additive? Have you noticed the car runs poorly if you don't use the additive?