Hay heath do I need to use this ams engine flush before I change over to amsoil? Thanks

reiser's Sig:

2003 quadcab 47re

No, it's never required. In some cases it might be a good idea.
General rule of them:
If you have over 100,000 miles, chances are there is some degree of sludge and varnish build up and would recommend one of two things:
1. Do an engine flush and then you're good to run the intervals the amsoil publishes.
2. You could just switch over without the flush but I would run my first two oil changes a little shorter interval, 7500 miles or so. The synthetic will be doing some cleaning so good to run it a little shorter. Then you'd be good to extend them after that.

It's a rule of them and pretty generalized. If you have over 100k and you've owned it the whole time and know it was taken very well care of, you probably don't have an issue. It's the trucks we buy used and don't know the history where I would do one these procedures if switching.

Heath

Heath's Sig:

AMSOIL Regency Direct Jobber
My AMSOIL Website
Buy AMSOIL at wholesale/purchase options.
Have questions or want pricing? Contact me

IF you do the flush, do you need to use regular oil to clean out the flush?

No. Just dump and go.
The best way to do it is take off your current oil filter and get a nice "inexpensive" one to put on. Dump in the 2 bottles of flush(about the same amount as what you dumped from the old filter) and run at high idle(1500rpm) for 15-20 minutes. Then dump it all and replace with new oil and new filter and you're good to go.