[LXPearl]

I have been running Mobil 1EP and it is still great after 10K miles. I am going 15K with M1 filter now. As SWUtah stated, the 4.7L is very easy on oil.

The quality synthetic oils have many advantages over dino. Flow, heat, surface protection, seals, viscosity stability, etc. The engine typically runs smoother and cleaner for a longer time.

On the other hand, if you plan to change oil at 3K miles, the quality dino oils have improved to where I do not see a cost benefit for synthetic, unless running extended drains.

You can peruse bobistheoilguy.com for a lot of info.

The dinos have additives to enable them to perform effectively. Those additives eventually wear away, which is why the Blackstone testing is done, it shows how much the oil and additives have worn away and if the engine components are showing wear. A quality synthetic has an excellent base oil for starters, with natural multivis qualities, excellent flow properties, resistance to heat breakdown, etc. Amzoil is considered the first true automotive synthetic. Mobil 1 EP is readily available and is an excellent product. The Autozone promo has been on for awhile and is a good buy. Mobil 1 EP is also available at Walmart. If you go 10-15K with M1 EP, you can save money and have comfort knowing you have a great oil for any weather or for heavy use.