rahtreelimbs

What are you guys with the 5.4 3 valve running???

vintageman

motorcraft 5W20 synthetic blend

Eco2014

When I had my 08 5.4 I used Ford Sys blend 5w20 an never had a problem

screamineagle

5w30 full synthetic. 200k trouble free miles so far.

sigmanf150

Royal purple full synthetic 5W-30. Just switched from 20 to 30 weight and I must say it runs quieter.

redeye3745

I use Mobil 5w-20 full synthetic.

jeremyyc

Right now Pennzoil 5w-20 dinosaur poop... Thinking about switching to 5w-30 regardless of the upcoming winter...

BassAckwards

Royal Purple 5w20 synth. Ran it for the last 50k miles. I'm at 130k and problem free. No cam phaser issues either.

lewissa81

I normally run Motorcraft 5w20 blended. Last week I put in Mobile One high mileage 5w30 full synthetic on preparation for a trip to NY in a few days. To be honest, I haven't noticed any difference. The motor didn't quiet down (it's quiet to begin with though). I'll go back to MC 5w20 when it's time. I didn't have any issues until it hit 190k. I replaced all the timing components about a month after I heard the first noise, so this truck will hopefully give me another 100k.

Mulestang

MC 5W20 is hard to beat. It's affordable, and it's quality. I run whatever is good for the money at the time. I just picked up some Penzoil Platinum from WallyWorld for $22.98, with a $10 rebate. $12.98 for PP is a better deal than the MC on that day. Myself, I just don't see the benefit of high-dollar synthetics unless you're going with a long OCI. But that's me, and the subject of oil is a dizzy frenzy of opinions...a swamp that I stay out of. I'm still waiting to see the report on the engine that blew up because they ran MC instead of an $8 per quart synthetic. But, it's your's money. Spend it and sleep well. Happy trails!