ZDDP additive????

Which brand is recommended or should i use a racing oil now the oil has had the zinc removed?

Waste of time and money I've always ram valvoline 10w30 or rotella 15w40 without additive and both my 4.0 are still goin strong at 200k

I use Amsoil AMO 10w-40 with added zddp already.

As mentioned above, Rotella 15w40 is very good dino oil. If you want to add zinc to protect your cam and lifters, check out Redline Engine Break-In Additive. You can use part of a bottle with each oil change.

http://www.ogracing.com/red-line-engine-break-in-additive-16-oz

I use RiSLONE w/ZDDP additive. Orilley's usually caries it.

There's no reason to EVER add anything to oil !
If you feel the need to do so than you need the correct oil.

I run Rotella T5 10-30 in all my 4.0's mostly.....more than enough ZDDP for our flat tappet style engines, I have no need for 15-40 as I don't live in 100 degree climates or have oil PSI issues. During the winter months I use a mixture of T5 and Pennzoil HM 5-30 in my WJ.

Racing oil is for just that........and it lacks the proper add pack for your application.