BroncoTrooper

I don't mind my 4.0, as even the relatively small amount of power it makes can still be fun if you drive it right. As far as reliability goes, mine only has 55000 miles, so I wouldn't be able to say a whole ton about that. No problems yet though. As others have mentioned though, these motors seem to handle FI well, as well as being able to run for a long time with proper care and maintenance.

Nordrel

Yeah it came with the service records the previous owner took extreme car of the vehicle. Probably one of the biggest reasons i bought it.

BroncoTrooper

Sounds like you're set for success then. Keep up with the maintenance and I'm sure your 4.0 will run strong for years to come.

THS_Steed06

I wouldn't say this engine has "Honda" or "Toyota" reliability and longevity but I know many Explorers with well over 150k miles that are daily driven. Some have even been used to tow boats and small campers. Towing is generally pretty hard on drivetrains FYI.

In a Mustang the engines not working nearly as hard to move it. So assuming it has been well maintained during its life I'd say 200k without too much trouble is quite attainable. Until the rigns wear out or the valve seals go the power output should remain close to stock. Mod away sir!

I plan to give my sixer to my son in a few years, by then it will probably have 150k or more (42k now).

Tom

FEB 2020:Just wanted to update this thread...I'm now at 173k and she's still running strong😁👍👍

aenima4six2

Great engines longevity wise. Def lacking on power and gas mileage compared to the newer 3.7, but still a good motor.

Nordrel

Well its good to hear I bought a reliable car thanks for the help!

aenima4six2

No prob , enjoy the new ride!

jdphillips73

My 2007 is xcharged and has 48k miles on it... my alternator failed at 30k, but other than that...ive only put gas in it...

mcrider

My sisters 4.0 has over 200,000 miles on it and still runs strong without burning any oil!

Bitter

I'm relatively happy with the mileage I get with my 4.0L. I get just over 30 mpg. Admittedly, a 5 speed, mostly highway driving and not trying to get 5.0L performance out of a 4.0L helps.