I plan to use Motorcraft 5-20 blend. It's what I've used in my pickup for well over 100k miles and has served me well.

Now if I were planning to use the stang in an extreme environment, I would go with full synthetic. And by extreme, I mean conditions where I was really cooking the oil with high temps or short drives where the engine is not brought up to temperature to evaporate moisture properly. In fact short drives is one way to kill an engine before it's time.

I think almost as important as the brand of oil is the freqnency of filter and oil changes.

 

Absolutely. I used to get well over 100K miles using 30W Pennz and a Fram filter and that was before they spent mega million upgrading the refining process. Our car does very little city driving, and usually does a 35 mile run one way, 3 days a week. We baby it except when the urge hits us to play. I do believe that pure synthetic oils actually do a better job in any situation, not just under extreme duty.

 

Mobil 1 and Motorcraft filter - about every 3,000 miles

 

Mobil 1 5W20, Motorcraft, K&N, Purolator Pure One, or Mobil 1 filter. Change every 5K miles. I will be switching to Mobil 1 Extended Performance next change.

 

Mobil 1 5w20 and Purolator Pure One

 

Valvoline, Motorcraft are good. Pennzoil sucks (started ticking sound til I drained it out) Quaker State sucks (foams)

 

I had a friend saw a Fram filter and examined it next to a cheap filter 1/2 the price, the Fram filter had less filtering properties than the cheap filter. I use a cheap filter and Castrol 10W 40 every 3000 to 3500 miles.