discussion Mild Hybrid longevity

[msm]

Over the years, BMW had introduced many new technologies for "efficiency" reasons - some would call it a means of planned obsolescence, as they sometimes become weak points that eventually affect long term reliability. Whether it was the introduction of start/stop, EGR's, DPF's, etc, it appears that the best solution if you're planning on keeping a car for a long while is to either disable (via software mods) or remove these components (via hardware mods) - or some combination thereof, once the cars our out of manufacturer warranty/MP.

It appears that most of the newer G+ cars from around 2020 onwards now have a more tightly integrated 48V mild hybrid system on more and more models. I've driven a few newer cars and the smoothness of the new stop/start systems are impressive - can't really judge if this makes a real life difference to performance though, as any marginal gain may be offset by potential future reliability issues.

Has anyone got a mild hybrid car with higher mileages (or just 5 years old now and out of MP) and had issues with them? What's the general consensus (ito long term maintenance and reliability) on these systems, especially now that there is one more battery to replace - and I suspect that a new 48V battery is not going to be cheap to replace each time, along with a whole lot of new ancillary components.

Keen to hear opinions and/or any real life experience of those with higher mileages/older cars, beyond "it works great on my new car currently"

 

[TBP88]

Over the years, BMW had introduced many new technologies for "efficiency" reasons - some would call it a means of planned obsolescence, as they sometimes become weak points that eventually affect long term reliability. Whether it was the introduction of start/stop, EGR's, DPF's, etc, it appears that the best solution if you're planning on keeping a car for a long while is to either disable (via software mods) or remove these components (via hardware mods) - or some combination thereof, once the cars our out of manufacturer warranty/MP.

It appears that most of the newer G+ cars from around 2020 onwards now have a more tightly integrated 48V mild hybrid system on more and more models. I've driven a few newer cars and the smoothness of the new stop/start systems are impressive - can't really judge if this makes a real life difference to performance though, as any marginal gain may be offset by potential future reliability issues.

Has anyone got a mild hybrid car with higher mileages (or just 5 years old now and out of MP) and had issues with them? What's the general consensus (ito long term maintenance and reliability) on these systems, especially now that there is one more battery to replace - and I suspect that a new 48V battery is not going to be cheap to replace each time, along with a whole lot of new ancillary components.

Keen to hear opinions and/or any real life experience of those with higher mileages/older cars, beyond "it works great on my new car currently"

Couldn't convince me to own something like that out of plan. BMW parts don't come cheap, it's one thing when your R500k BYD depreciates to 0. Another entirely when your R2m BMW XM goes to 0...

 

[MR_Y]

I am also watching this topic intently.
My Volvo has a 48V mild hybrid setup.
I don't see myself keeping the car beyond 100,000km (out of Plan) given the relative newness of this technology.

Keen to hear others views.

 

[AshG108]

Over the years, BMW had introduced many new technologies for "efficiency" reasons - some would call it a means of planned obsolescence, as they sometimes become weak points that eventually affect long term reliability. Whether it was the introduction of start/stop, EGR's, DPF's, etc, it appears that the best solution if you're planning on keeping a car for a long while is to either disable (via software mods) or remove these components (via hardware mods) - or some combination thereof, once the cars our out of manufacturer warranty/MP.

It appears that most of the newer G+ cars from around 2020 onwards now have a more tightly integrated 48V mild hybrid system on more and more models. I've driven a few newer cars and the smoothness of the new stop/start systems are impressive - can't really judge if this makes a real life difference to performance though, as any marginal gain may be offset by potential future reliability issues.

Has anyone got a mild hybrid car with higher mileages (or just 5 years old now and out of MP) and had issues with them? What's the general consensus (ito long term maintenance and reliability) on these systems, especially now that there is one more battery to replace - and I suspect that a new 48V battery is not going to be cheap to replace each time, along with a whole lot of new ancillary components.

Keen to hear opinions and/or any real life experience of those with higher mileages/older cars, beyond "it works great on my new car currently"

Stupid question here, my C250 CDi had a separate battery or auxiliary battery that controlled the Start/Stop, and a few other functions in the car and not sure how similiar this is to the "mild Hybrid" solution in BMW. However, when that little battery went low on my car, it costed R1100 to replace and was a very quick replacement.
My stupid question is how similar is this to the Mild-Hybrid systems now offered and if anywhere close to this, will it possibly also be cost effective to maintain?

Edit: So I searched it and it seems Merc's older version of "Mild Hybrid" was the use of the aux battery system but have same systems not as BMW:

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