What I would do is have the oil changed but make sure you use Valvoline Restore & Protect and a new quality filter (OEM Toyota, Wix, Mobil 1). Drive the car about 1600km, then do the oil change again using new oil and filter, drive again for 1600km, do it a 3rd time.
Just get Mobil 1 0w-40 better then all of these
Mobil 1 fully synthetic, multi-grade oils only.
Mobil 1 15w-50
M1 fs 0w40 has been working well for me. But this oil does lose some of its viscosity after a couple track days.
I buy mobile1 high mileage 20k mile oil and change it every year (less than 5k miles per year on my G coupe)
Mobil1 0W-30 full synthetic. Just did my first 1000-mile oil change a couple hundred miles ago. Been using Mobil1 0W-40 on my 2011 WRX for 220k miles, tracked, autocrossed, and daily driver duty after 160k miles when I had a head gasket failure and I rebuilt the engine.
If it says 5W-30 then the Hella synthetic should be fine. Except you can do all the other checks yourself. If they will use your parts that is ideal, get a Mazda filter and something like Pennzoil Ultra Platinum, Castrol or Mobil1 synthetic if you can get that.
I burn a little bit of oil and started to run the Valvoline restore and protect 5w30 in my n18 r56 with 178k miles (286k km). Hard to tell what burns vs leaks out though.
I do believe that Valvoline R and R can cause oil leaks. I have noticed that in a couple of cars.
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