Ecoboost vs 5.0 V8 reliability - Ford Mustang Forum
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post #1 of 7 (permalink) Old 4 Weeks Ago Thread Starter
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Ecoboost vs 5.0 V8 reliability

I am new here. I am looking into purchasing my first mustang. Ive always wanted one. So I’m looking for some opinions on the ecoboost ( have not heard a lot of good on turbocharged engines) as far as reliability and any issues that have come up.

The V8 has the plastic intake manifold cover which is a concern.

Any information would be greatly appreciated.

Thanks,
Kathy

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post #2 of 7 (permalink) Old 3 Weeks Ago
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Hi Kathy, I for one (with the exception of Diesel engines), do not like a turbo/supercharged engine for daily driving..... regardless of what the oem manuals say, turbos beat the crap out of the oil....so IMHO, forget the 5-7K oil change intervals...along with most of the other extended service schedules as well. Although the design & engineering is excellent, the complexity of the engine and it electronic engine management systems is "Huge"...… meaning when things work right they are great, when they don't failure typically occurs and it is typically very, very expensive....ie. catastrophic level damage.


Gas mileage, well, in "theory" it should be wonderful but in reality, when you compare driver to driver to vehicle to vehicle in the same driving conditions, a normally aspirated engine will most always get better gas mileage than a boosted one....the only exception would be highway conditions where you have the cruise control engaged......but the increased mpg would be 1-2 mpg in most cases.


With regards to the intake manifold being plastic, yes, very true, and back in 1997 that is when they had a lot of failures caused in part by them merging aluminum and plastic together....that didn't work out all that well. Every engine mfg today has plastic intakes (including many high end supercars)...so you really can't get away from them..... but there really isn't a need to run from them either as they are very dependable, few have issues but they are considered a "disposable/repairable component"... but they are designed to be repaired easily....the o-ring gaskets that seal them up are usually the issue...and the o-ring assembly is a replaced part..... and not that bad of a job.

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post #3 of 7 (permalink) Old 3 Weeks Ago Thread Starter
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Hi Beachkid. Thank you for your reply. I am looking at getting a GT no older than 2015. Its funny now that Im looking for one there is not a day goes by that I don’t see at least one on the road. Its temping to get one that is not exactly what I want, but I will holdout for what I want.


Kathy
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post #4 of 7 (permalink) Old 3 Weeks Ago
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I think a good read of the S550 forums will produce enough info on the pros and cons of the Eco and 5.0.

Neither the Eco or 5.0 or S550 platform is problem-free, so for peace of mind you can purchase a pre-owned that still has factory warranty remaining. Or look into an extended warranty through a Ford dealer on-line. Lombard and Ziegler are just a couple of ford dealer that sell them in volume. Options options . . .
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post #5 of 7 (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by KathyPepper View Post
Hi Beachkid. Thank you for your reply. I am looking at getting a GT no older than 2015. Its funny now that Im looking for one there is not a day goes by that I don’t see at least one on the road. Its temping to get one that is not exactly what I want, but I will holdout for what I want.


Kathy
a couple things to be aware of Kathy when looking at used cars...… when the coyote engines 1st came out in production (the 1st few years) there were significant design/engineering/production related problems....so significant that IIRR, there was an engine replacement recall..... including piston slap (which they told customers they just have to live with)...not a good thing.... until 2016 (IIRR) when the new gen of coyote engine was produced and shares very little with the original design. There have also been transmission issues...… it's year specific but the late model sticks (for a short duration) had aluminum shift forks and were breaking like candy.... the autos, very good/the same stout trans used for years (basically). Also AC dryers/accumulators….. issues with the later models (along with camero, challenger, etc.)… they are located behind the dash....and are known for failures....definitely supplier defect (leaks Freon)..... although the part is relatively inexpensive ($100 or so)….the dash has to be almost pulled to access.....typically $2500- $3,500..... and even with most every newer car, these are located in the same location...and if the AC compressor fails (just part of life), it is a component that is required to be replaced if you want to maintain the new part warranty..... kinda a catch 22 situation.


Here's me as a "Dutch Uncle" talking now....


no matter what used car you are looking at, take it to a mechanic for an inspection...including looking at the Mode 6 file (ecm) which will not only ID what the past uses/reprogramming has been but will also ID how many times a particular trouble code has been activated and secondly...a frame shop..... combined, this will cost a few hundred dollars but an honest seller will have no objections and it will be cheap insurance to know that you are getting a truly good, solid car.


ok, I'm done now!

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post #6 of 7 (permalink) Old 3 Weeks Ago
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yeah I would go for the V8 for sure, less potential reliability problems due to the turbo, and a V8 is required for a "real Mustang" (LOL, personal preference . . . )

the ecoboost in my friend's fusion ate its turbo just after the warranty expired, I know that doesn't always happen, but the engine can't eat its turbo if it doesn't have one
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post #7 of 7 (permalink) Old 3 Weeks Ago
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I have been driving turbo 4s continuously since 1985 as my daily drivers. I have accumulated about 3/4 of a million miles and have never had a turbo or internal engine failure. Also, all of them were tuned and were making significantly more power than stock.

The high mileage champ had 240,000 miles and was running great when my son totaled it. The next high mileage one was 196,000, i sold it because i needed to reduce the number of vehicles i had. All others but the two Ecoboost Mustangs had well over 100,000 miles. Haven't had them long enough to rack up over 100k.

The reason i have driven turbo 4s for so long is i find them to be the perfect combination of power and economy. Keep your foot out of it and you get the same mileage as an equivalent naturely aspirated 4 cyl. When using the power you will get the same or better mileage compared to a naturely aspirated engine of the same power.



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