When should I start using synthetic oil??

[SilverGlow]

Originally Posted by TheSilkySmooth

The synthetic oil in the US is "fake" so just keep running your favorite "conventional" API SM oil and you're good to go. The Syntheics here are at most semi-synthetics and have marginal improvements in cold viscosity and sludge generation and cleaning. The Two Top picks in a premium oil would be: Penzoil Platinum, and, Mobil-1 Advanced Fuel Economy 0W-30 - a much better oil than regular Mobil-1 5w-30. If you want to spend 8-10 bucks a litre then you can step up to "real" synthetic from Europe which would be: Motul, Total, Fuchs, Pentosin - just be prepared to purchase online. Your oil filter choice is MORE important; ditch that cheap Thailand Toyota filter F-A-S-T and get a Purolator pure one or Mobil-1 or Bosch.

I could not DISAGREE MORE.

There are MANY true fully synthetic oils sold in the USA, and made in the USA.

Don't you realized that even with the "inferior" US sold synthetics, your Yaris will still last 300,000+ miles?

And there is nothing wrong with the Toyota filters for the Yaris.

You constantly vomit wrong information.