"Free" Toyota Care oil changes in my 2012 are done. Synthetic or conventional oil?

[fnkngrv]

If you are looking for the best answer it would be to follow what the oil and filter manufacturers recommend with the following caveat:

Every engine uses and consumes oil differently. A certain engine size/model/type has a general manufacturer's suggested interval however the only proper way is to have an independent oil analysis performed at the suggested interval end point. This would be the best way for you to determine when you need to change.

LOOKING AT, FEELING, AND SMELLING OIL IS NOT A VALID WAY TO DETERMINE IF IT IS STILL GOOD OR DIRTY!

That being said do a search here for oil analysis and you should find some good information. Hersey for example is a senior OG member and he has done several as far as I am aware. If you are that concerned than making best guess judgements won't cut it. I am an Independent T-1 Certified AMSOIL Dealer so I have seen a lot of scenarios.

I will leave it at that. Good luck and if you wish to pick my brain more feel free to shoot me a PM.

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