It's all I have ever used and have no reason to change. I'd say stick with MC across the board!

 

Motorcraft is the ONLY filter to use on a Ford!!!!

 

I've gotten over 350K miles using MC filters and Castrol GTX 10W40 every 5K miles. Religiously!

 

10W40 in a 5.4L Modular????

 

Yikes!!!!!!!!!!!!!

 

In a warm climate, that should not be bad.
I always use 5w30 myself, but then that is year round, and at -50 some days, it is a lot thicker I bet than any 10w40 is in more moderate temps.

Where are you located Jethro?

 

I'm in TN but drove that thing all over the country. 10W40 spring thru fall with half 10W50 in the middle of the summer. And half 10W30 and 10W40 in the winter.
The thing still runs like new except for that danged piston slap on start up. It's been doing it since 100K.

 

I guess if it works, it works, but with the tight tolerances and with the cams riding on oil film, I'll stick to the thinner oils that can get places faster and easier.

Mike

 

I agree and have always used 5w30 in all my 5.4 motors.

All my companies work vans even ran 5w30 year round,and had great luck with everyone of them.

 

The 5W30 is fine for when they have low miles but when the gaps widen with wear the thicker oil works great at engine longevity and slows oil burning. I can go 5 K and only use about 1.5 quarts of oil even with those high miles. If I tried to run the thin stuff it would more than double that.

 

I heard that the modular engines (v8-v10) uses oil spray to lubricate the cylinder walls, and using a higher viscosity oil than 5w-20 will cause cylinder wear and piston slap over time because of lack of oil reaching the cylinder walls until the thicker oil has warmed up.

 

The engine pictured in the link below was pulled from my car with 215K miles on it. I tore it down to examine and check clearances when I put the new "built" engine in it's place. EVERY SINGLE item in the engine was within OEM new engine assembly tolerances. It has 5w50 Syntec ran in it for 120K miles,and 10w30 Mobil 1 after that. It never saw 5w20 a single mile in it's existence.
Index of /jlangton/215KmileRomeo
JL

 

I always run 5w30 in my ford modular motors, mostly because my friend who is a ford tech said to.
He has told me that on a warm day if you work it at all hard the 5w20 is too thin to protect well.
By using 5w30, you get the thin oil of 5 weight on start up, but better protection when its hot.

I also do not baby my trucks, I have a truck to haul and tow, so IMO its more important to someone like me, than someone that uses their truck for just commuting back and forth to work, and haul their quad in the box on weekends.

 

amsoil filter eao11, amsoil also makes a 0-20 oil.

 

CHA CHING!!! Too expensive for me. I'll stick with Motorcraft filters.