ICE Break In?

[BXFXJeep]

I get a feeling that the break in has more to do with a failure happening when you are going 100mph on the highway.

Imagine if a wheel or similar comes loose at 100mph.

I usually don't gun it and drive with the radio off to listen for weird noises, granted the uconnect is a weird noise all by itself.

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[Luxy60]

The 4xe definitely has a few weird noises, especially coming out of V6 JLU.

 

[martoaj]

With what I have learned now about these PHEVs, I wouldn't be using hybrid mode. Either all engine for the commute, or all electric. You don't want to end up in FORM. That is, the engine stopping and starting often doesn't seem to do the engine well in the cold with PHEVs.

I've driven on Hybrid mode (as is the default on every startup) for 1 year and 6000 miles now, and I've never touched FORM. I don't charge at home, but charge regularly at destinations so I'm driving electric-only a considerable amount of time.

At some point you've gotta just let the truck do what it wants to do. Not sure why so many people bought a 4xe, only to be angsty about what the powertrain is doing and fight it all of the time. An overwhelming majority of the time, it does what's right and no amount of you babysitting it is going to change the path.

Why spend thousands of miles and many months not just enjoying your truck, because you're worried about FORM kicking in at some point? Drive it and have fun, and if FORM comes, that's when you can come back to the forums and investigate. FORM is here as a safety net, so you don't have to track and manage the ICE/electric balance yourself. That's the whole point.

 

[Paluss]

Break-in is also for tires, brake pads, gears and other lubricated wear in parts, and mostly for the "Nut" behind the wheel. Unless your are coming from the exact same vehicle it takes a few hundred miles to get use to the handling, braking, acceleration, etc. of a new vehicle before you are able to control it comfortably. Its not uncommon for drivers (especially younger drivers) to have accidents in the first few miles due to braking distance, cornering to fast, or driving to fast and loosing control of a vehicle....

 

[mwilk012]

With what I have learned now about these PHEVs, I wouldn't be using hybrid mode. Either all engine for the commute, or all electric. You don't want to end up in FORM. That is, the engine stopping and starting often doesn't seem to do the engine well in the cold with PHEVs.

That isn’t how FORM works.

 

[Bzinsky]

There are two things the 4xe will let you do, but you should never do.
-heavy throttle that turns on the gas motor when it is stone cold.
-switch it into manual mode while moving at a decent speed (this is the worst thing you can do)

The engineers cannot possibly do anything about that stuff. There is way for any engineer to account for a cold motor suddenly coming to life and spinning at 4k rpm, they were forced to allow the jeep to do that. It’s just a downside of a PHEV.

 

[Msquad]

That isn’t how FORM works.

Yeah thanks, but wasn't defining FORM.

 

[libis22]

I wonder who writes this!

A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in.

Can we make it a little easier to follow? what's recommended speed/RPM till 60 miles? I am assuming as per this paragraph, it should be less than 50-55 mph which I didn't do as I took it on a highway. I was doing 70-ish but accelerated easy..
Probably didn't strictly follow the 300 miles 50-55 mph restriction as well. I only did higher RPM accelerations after first 500 miles. I have 2.0T. Let's see how it does. Also bought a extended warranty just in case!

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