Use it in my bike right now; huge improvement over dino oil, that's for sure. Getting ready to put it in my truck and my van next week. Very happy with it thus far. Their filters--well, I still use Purolator, Bosch, etc. that I can find at Auto Zone and they work just fine IMHO. The ea filters that AMSOIL sells, along with the WIX filters, are probably good but a little too pricey for my taste.