Usually, I use penzoil for 97 Lexus ES300. I tried ST conversion oil a few times. With ST oil the engine runs noisier right after change or after 1500-2000 miles. With penzoil or valvoline engine works smoothly and quietly. The difference is like you drive a newer car. This condition last up to 4000 m. (dint drive longer with one oil change).
I would recommend change ST not longer than 3000 miles, or use a good brand oil during 5000 m, if you want to compensate for the difference in price. Also, brand new ST oil is darker and smells bad. I think it is because this oil contains higher (maybe 40-50%) proportion of recycled oil. To be fair, didn't see any difference in mpg and cleanness.
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