SYNTHETICS
as far as they go, unless you run over 6k miles in oil change intervals, run the absolute snot out of your truck from offroading and etc, have a turbo or other modification i would stay with a blend or just good ole dino. the #'s show that dino has just as much protection as syns do within 5k miles and some even more... so really take your pic but here are the synthetics baseIII and up that really stuck out #'s wise these are based on 5w30 and 10w30 weights
-the typical amsoil and redline
- royal purple did ok
- valvoline full syn did much better than mobile 1 (the durablend and maxlife had better #'s also)
- castrol syntec and penzoil platinum did well, better #'s than mobile 1 syn
- mobile 1 syn, not too bad but to me, not what you pay for.
- penzoil and havoline syn, both very affordable and still getting a "syn" if i had to chose between the two it would be the penzoil platinum. it has shown good numbers. i dont think anyone has done a test with havoline syn but it shouldnt be any worse than most. they are usually on sale and or cheaper than other syns..
--- the trick with syns is that you have to switch out the filters atleast every 5k miles or else most of the time you will have high lead and iron count which isnt very good for your motor...
if you have to have syn i would go with whats on sale to be honest. they are all very good. everything i have posted is what i have read and observed on other forums so dont jump to conclusions that i am some oil expert haha.. bc i am not, but the #'s dont lie.. it was enough to sway me and i am very loyal to products that i know that work.