on any even remotely well built engine 5,000 miles is a reasonable service interval. That’s what you should do if you’re planing on keeping your car for a long time.

Most manufacturers recommend longer intervals and most of the time that’s just misleading.

In the case of the EcoBoost, GM 1.4T, the PSA PRINCE, Renault 1.3 tCe (and many more!) - the oil change interval they recommend is way too long for that engine. On those if replace the oil every 3,000 miles.

But, on some engines like the B4204S3 from Volvo, PSA EW-series, Renault H4M (and maybe a few others) can easily go over 200,000 miles with long oil change intervals (although I still recommend changing the oil every 5k just to be sure)

There can be many factors. First off it's an Ecoboost LOL. Secondly, sure every 5k miles but what oil was changed, if it's at a dealership, did they let the interns do the job? How does the customer drive the car? It's not hard to blow a gasket in lest than 20k miles. Especially if you start it then rev really hard immediately everyday continuously and drive crazy. Any excess load could cause this too. I think in this case, the mechanic here did good with the initial diagnosis but came to the wrong conclusion. And lastly what did this engine come from? Ecoboost in big ford trucks especially tend to have a high fail rate.. them turbo 4cyl's man...

Seems fishy to me.

That is one terrible engine

My dad changed the oil once every 20k miles on his 66' mustang and it was still running strong at 150k miles when he sold it. That 1.5T engine from ford must be awful. This just shows how american car companies have experienced a major decrease in quality control over a period of time.