I have a 98 Toyota Tacoma with 206 K miles. My truck has always run Amsoil 5w30 and a factory filter. The oil is changed once a year and the filter twice yearly. I recently ran into a contractor with a 92 Tacoma with 268 K miles on it. The man's truck showed minor dents and scratches but was purring like a kitten. The engine had never been apart. Being a BITOGER, I had to ask the man what oil he ran to get that longevity. The man gave me a puzzled look and said any oil of the correct weight
I will probably continue with the Amsoil in my truck, but, it looks like the Toyota four cylinder will last darn near forever with any oil, dino or synthetic.
FYI

I will probably continue with the Amsoil in my truck, but, it looks like the Toyota four cylinder will last darn near forever with any oil, dino or synthetic.
FYI