Am I getting scammed by my main dealer?

sparklymarkly

The point of a differential is to allow the rear wheels to rotate at different speeds.
If you put a set of cheap & nasty tyres on, like you did with your “Porsche” a few weeks ago, the lack of grip offered will probably allow both wheels to slide around as they please. Job sorted!

boobyd

Not to sure why your asking,with the Porsche and BMW you have £80k + worth of car yet you are cutting corners/scrimping on them.
Are they Airfix models who something similar?

caprikid1

I'd be interested to know if the dealer took the 1.3 Yaris in Part Exchange for an M4 Competition . That probably has to be the most odd trade in , alternatively did you keep the Yaris as a daily to keep the mileage off the M4 and the 911 ?

Ayr_Rage

caprikid1 said:

I'd be interested to know if the dealer took the 1.3 Yaris in Part Exchange for an M4 Competition . That probably has to be the most odd trade in , alternatively did you keep the Yaris as a daily to keep the mileage off the M4 and the 911 ?

Talking of ridiculous trade ins, my best was around 2007 when I traded a Toyota Prius for a Jeep Grand Cherokee SRT8 (6.1 litre petrol V8 for those that are wondering).

The Toyota Prius web board members had apoplexy at my decision when I announced I was leaving.

Two years at an average of 14.9 mpg was expensive fun.

Stubod

facade said:

Stubod said:

It's a well known fact that BMW RWD cars do NOT have a rear axle. They use an alternative "capstan" gear system which means your deler is really trying it on. I strongly advise you confront the dealer with this and then find a better garage....

Only partially correct I'm afraid, they don't have a conventional axle.

They use individual rubber drive belts from the variomatic unit to the wheels, so they don't need a differential, as the variomatic pulleys account for the variations in wheel speed.(This is the capstan drive you are referring to)

Usefully, if one belt breaks, you can carry on driving on the other (because there is no differential)

..I was refering to the post Cromby models that negated the need for this, but otherwise you are so right...many thanks for clarifying...

Grumpy_chap

raptor2004 said:

My F82 BMW M4 Competition is due a minor service and my local main dealer told me I need to change the oil in on the rear axle differential. I have never heard of such a thing, a minor service is usually just the engine oil, oil filter and microfilter. 

I did a bit of research only the only cars that have a rear differential are generally 4x4 cars so why is my main dealer charging me for this?

Looking at the service history on the iDrive, there is no mention of the rear axle differential oil having been changed so why suddenly now? Does my car actually have a differential and if so, why does an ordinary coupe car need one?

The M4 is a nice car, rather specialist (and powerful) and something to cherish and care for with passion.

Rather than doing whatever general research you have done, the simplest way to assess this would be to reference the service schedule for your car.  That will ensure specific information.

The important thing with specialist and powerful cars is to maintain them to a "money no object" level as failure to do so may result in a very negative outcomes - either handling deteriorating impacting safety or further mechanical failures that far outweigh the original saving from the economised servicing.

Wonka_2

Grumpy_chap said:

raptor2004 said:

My F82 BMW M4 Competition is due a minor service and my local main dealer told me I need to change the oil in on the rear axle differential. I have never heard of such a thing, a minor service is usually just the engine oil, oil filter and microfilter. 

I did a bit of research only the only cars that have a rear differential are generally 4x4 cars so why is my main dealer charging me for this?

Looking at the service history on the iDrive, there is no mention of the rear axle differential oil having been changed so why suddenly now? Does my car actually have a differential and if so, why does an ordinary coupe car need one?

The M4 is a nice car, rather specialist (and powerful) and something to cherish and care for with passion.

Rather than doing whatever general research you have done, the simplest way to assess this would be to reference the service schedule for your car.  That will ensure specific information.

The important thing with specialist and powerful cars is to maintain them to a "money no object" level as failure to do so may result in a very negative outcomes - either handling deteriorating impacting safety or further mechanical failures that far outweigh the original saving from the economised servicing.

Presumably you've looked at who the OP is and their previous posts ? It might save you wasting any more energy

photome

Still waiting on the pic of the Porsche.

Grumpy_chap

Wonka_2 said:

Presumably you've looked at who the OP is and their previous posts ? It might save you wasting any more energy

I am only trying to be kind and helpful in the spirit of the forum.
In fact, I found that the servicing costs for a BMW M4C have been discussed previously.  This might assist the OP and save others the need to re-cover old ground:
https://forums.moneysavingexpert.com/discussion/6327621/servicing-costs-for-a-68-plate-bmw-m4-competition/p1

One thing to be aware of on these cars is the body kit and the risk of a split splitter.  Apparently.
https://forums.moneysavingexpert.com/discussion/6327369/fix-a-front-carbon-fibre-splitter

Iceweasel

facade said:

Stubod said:

It's a well known fact that BMW RWD cars do NOT have a rear axle. They use an alternative "capstan" gear system which means your deler is really trying it on. I strongly advise you confront the dealer with this and then find a better garage....

Only partially correct I'm afraid, they don't have a conventional axle.

They use individual rubber drive belts from the variomatic unit to the wheels, so they don't need a differential, as the variomatic pulleys account for the variations in wheel speed.(This is the capstan drive you are referring to)

Usefully, if one belt breaks, you can carry on driving on the other (because there is no differential)

Exactly right - BMW simply copied the DAF variomatic system from the folks at Eindhoven.