I hope this post is in the right place.
A was thinking of installing an Amsoil By-pass oil filter (BMK17) and running Amsoil synthetic oil for the purpose of extending mileage between oil changes. My wife and I are planning on becoming full-timers in our RV. So 75-80% of our driving will be towing.
I am trying to find out at what interval should the filters and/or oil be changed. I have searched the forum and have found a verity of answers. What would you recommend?

Ask your Amsoil dealer. He should offer you a free oil test after a year. Mine is coming up soon. GOOD LUCK

You need an oil analysis done to decide that.

Damn to slow, but I wouldn't go to a Amsoil dealer they could be a little bias.

Oh forgot to say this. Should put the blocker plate anf finger stick in first.(Can be puchased on KENNEDY on this site just do a serch.
That will cut down on soot into the oil a little.

Before you install the bypass, read this article. If you have good filtering, and no engine problems, the new Amsoil Ea and oil sampling might be all you need.
http://dieselplace.com/forum/showthread.php?t=144788

Thank you everyone for your replies. :)
Modified, thanks for the reference post, VERY informative. I think the EaO filters are the way to go. No need for modifications and longer drain intervals, kinda like having your cake and eating it too.
:thankyou2

That was a good thread and great info, thanks.

A little late in responding, but very good points made. Unless you're planning on going huge miles or longer intervals than a year, the EaO full flows will do the trick.

With sever duty which you will be doing is 15K or once a year on the full flow and the bypass will go 40K or once a year.

On my own LLy I have 40K on the oil but I do oil analysis. !%K is no problem even towing all the time.

Greg