Here is the latest oil study for many of the popular 5w30 motor oils
http://www.amsoil.com/lit/g3115.pdf Keep in mind the deal I'm offering that will allow you to get dealer pricing for no additional cost for 6 months on Mothers, WIX, Trico, Donaldson filters, Mann filters and all of AMSOIL's products. Use this link
http://www.amsoil.com/opportunity.as...type=preferred to get the wholesale pricing. I will send you the 6 month trial period cost back along with a calendar and you will receive a monthly magazine. I use this product in both my DD's and have been very happy! Match it with an AMSOIL filter and go 15,000 miles or once a year.