ive got an 04 4.7 with 196000, im having some misfire problems that i cant figure out but other than the money ive thrown at that i havent done any repairs since i bought it new, just tires brakes and batteries. And i use that Mobil 1 10k mile oil, and i change it every 10k and ive never had a problem. i also pull a tandem axle car hauler and a tandem axle dump trailer behind it constantly, along with a boat and 4 wheeler trailers. I wouldnt hesitate to buy one with 140k... still has several good years of use.

 

Don't worry about it.
I only bought one new car in my life, but many used ones. I think the 140k miles is more of an indicator of overall use... the care and feeding for it's entire life is hard to gauge.
Maybe a new car, or used with very few miles, had a coolant leak and got severely over heated for just a short time... it happens.
Don't worry about it... that will ruin your day

 

Patric , You have that many miles on you're 4.7 because you took care of it..Not everyone does . That's what kills them. Wrong oil~right oil too late~etc..
The perfect truck for me is a NICE ram with a blown 4.7 @ about ~ 160.000 miles . I can swap the motor to a 5.7 Hemi and have a nice truck that will get 250.000 miles plus , with no worries..
I agree with sdibaja ... Don't worry "Be Happy".. Worry will ruin you're day....
........"God Speed".......

 

Been busy haven't posted for awhile. My Dakota has only had the oem recommended oil in it and I am at 180,000 now, my truck starts everytime and gets oem mpg. The 4.7 will not tolerate conventional oil, you must keep it clean (a little chemtool or seafoam once in a while) and only use syn oil. Just bought my wife an '07 Durango with the 5.7 Hemi and it will also get oem recommended oil at recommended intervals. I have owned vehicles from the 60's to '07's and strict maintenance is always the secret weapon. Take care of it and it will last.

 

Just like all cars, it depends on how it was maintained throughout it's life.

 

I have two Durangos a 2001 with 100,000 on it and a 2004 with 40,000
Both have the 4.7

The 2001 - has only had synthetic 5W50 Castrol, never a problem. The only complaint is window mechanisms, ball joints, and fan resistors (4) so far.

The 2004 - I've only had 6 months. so far so good. I know the 5.7 has issues with oil viscosity due to the nature of the lifters used on the 5.7 but I have seen nothing to suggest that the 4.7 is viscosity sensitive. I believe any problems encountered are due to poor maintainance.

IMO If the viscosity as in 5w30 vs 10w30 or in my case 5w50was an issue, you would see higher rates of engine failure in the colder climates do to poor oil circulation at cold start-up.

 

110k+ and engine running well.

 

Anyone have a problem with lifters tapping for the first 69 seconds of start up iin the am?

 

yes the 4.7 is known for noisy lifters on cold starts (ex first thing in the morning)

for the most part the 4.7 is a very good engine as long as it has been taken care of, i have seen many with over 200k on them and i remember being told that they were a 150k mile engine (the same source claims the old 5.2 and 5.9 were 100k mile engines which are known to break the 300k mark) based on that you will likely have no problems if you do basic maintance.

 

I recently read on a web site that did a study of numerous oil filters, that the lifter noise on start-up in some engines is caused by cheap oil filters. The orange filter that I use is one of those cheapies. I am going to try a different manufacturer and see if the filter is the cause of the start up lifter noise. If so, I will post.