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Hi All,

Finally bought one of my dream cars- a 2005 E63 M6, ever since seeing these cars on Top Gear in the UK I have lusted after one!

I am fully aware of the maintenance issues with these but I have experience with other troublesome older cars so am ready to take on this ownership challenge!

I bought a well maintained car (rod bearings replaced about 5k miles ago) and so far- no major issues, so I think...

I scanned for codes a few weeks ago as the car had a tendency to raise its idle to around 1k in traffic, I gather this is quite a common issue on these cars?

I pulled the following codes- 2B59 Coolant thermostat monitoring, 2789 Detection rough road, and 278A Ambient temperature. I cleared them and drove the car quite a bit over the following weeks and no codes returned.

Scanned again today though and got one code- 27BB Function camshaft control, exhaust, bank 1. Are any of these codes related please? Wouldn't appear so? I have cleared this code and will see if it returns.

Finally, I have the clunking noise at the rear at low speeds which I gather from this forum is common too- related to an upgraded differential oil being required? However, I now notice an intermittent slight groaning sound at the rear when turning hard right at low speeds or if going round a right hand bend and holding the wheel in place. Any ideas on this please?

Sorry for all the questions, any help would be much appreciated though!

Thanks,

Giulio
 

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You might repost this in the E60 M5 forum to get more responses... Things are kind of quiet in this forum these days.

I would offer some help but I haven't driven an E63 M6 for over 6 years.. Just getting ready to start a build on a new one which is why I'm perusing. :)

Welcome to the club!
 

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Thanks for the reply and welcome! Just noticed that this forum does seem a little quiet.

Building a M6, wow that sounds like quite a challenge! I wouldn't know where to start with such a project!
 

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Welcome to V10 M6 ownership ! had my 2005 for over near 4 years, love it everytime I drive it, love the sound, the engine and despite what many say the smg gearbox adds a whole new level of enjoyment once you know how to use it.

So one thing that is real important and cannot stress this enough is maintaining the battery charge level to max. these cars have many, many modules and integrated system that work with both the high and low level canbus system, any reduction in the charge level causes issues on the canbus power rail will give give problems.

The issues can be random and meaningless fault codes, warnings and module failures, but a smart battery charger Ctek 5.0 MXS 5.0 it will be the single best purchase to keep your M6 happy.

The noise at the rear can be the lubricant settling in the diff, there is a cure, you change the oil and add a Bmw friction modifier.

The codes, well see above with the charge state, you never know, the idle speed raising when warm can be low charge, low temp and the engine stuck in cold start mode, but also seen adaption issues with the cat sensors can also be to blame.

Engine oil changes, firmly do mine on time and less than 4k miles, excessive maybe but its like money in the bank !

Whatever you do, just get out and enjoy that noise one you pass 4k rpm, its intoxicating !!
934626
 

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Hello again!

Sorry for not being clear. By a new M6 build, I mean that I have just picked up a stock 2010 M6 and will start a customzing it and adding performance parts, etc.

In the US, we shortcut that by using "build" to describe the process! :D(y)

-b.


Thanks for the reply and welcome! Just noticed that this forum does seem a little quiet.

Building a M6, wow that sounds like quite a challenge! I wouldn't know where to start with such a project!
 

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Welcome to V10 M6 ownership ! had my 2005 for over near 4 years, love it everytime I drive it, love the sound, the engine and despite what many say the smg gearbox adds a whole new level of enjoyment once you know how to use it.

So one thing that is real important and cannot stress this enough is maintaining the battery charge level to max. these cars have many, many modules and integrated system that work with both the high and low level canbus system, any reduction in the charge level causes issues on the canbus power rail will give give problems.

The issues can be random and meaningless fault codes, warnings and module failures, but a smart battery charger Ctek 5.0 MXS 5.0 it will be the single best purchase to keep your M6 happy.

The noise at the rear can be the lubricant settling in the diff, there is a cure, you change the oil and add a Bmw friction modifier.

The codes, well see above with the charge state, you never know, the idle speed raising when warm can be low charge, low temp and the engine stuck in cold start mode, but also seen adaption issues with the cat sensors can also be to blame.

Engine oil changes, firmly do mine on time and less than 4k miles, excessive maybe but its like money in the bank !

Whatever you do, just get out and enjoy that noise one you pass 4k rpm, its intoxicating !! View attachment 934626
Thanks for the reply- appreciate the advice! Definitely going to look into the battery first and will then arrange for diff oil and engine oil change. I didn't realise how quickly these beasts drink oil... mind you I live in London so I guess heavy city traffic does not help the oil consumption!

The noise is certainly intoxicating! Went under a railway tunnel and dropped a gear the other day and literally thought I was in heaven... every single person in the street was staring!
 

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Hello again!

Sorry for not being clear. By a new M6 build, I mean that I have just picked up a stock 2010 M6 and will start a customzing it and adding performance parts, etc.

In the US, we shortcut that by using "build" to describe the process! :D(y)

-b.
Ah I see now- got the lingo! Would have loved a later version but they were a little out my budget and in the UK you pay quite a bit more in tax on the later cars due to emissions changes.

Would love to see pics of the finished build!
 

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Giulio,

Welcome onboard and I hope you are enjoying your 'beast'. I've had my E63 M6 for about 9 years and it takes getting used to its querks. I have not had any major issues with it because it is maintained and serviced regularly. The diff oil change should hopefully sort out the rear end clunking noise. I eventually swapped out the SMG for a manual tranny and it's a much better driving experience.
 

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Finally, I have the clunking noise at the rear at low speeds which I gather from this forum is common too- related to an upgraded differential oil being required? However, I now notice an intermittent slight groaning sound at the rear when turning hard right at low speeds or if going round a right hand bend and holding the wheel in place. Any ideas on this please?
The clunking or groaning noise on low speed right hand turns is a well known issue on M5s and M6s. We all have the same rear diff. I have it on all 3 of my M5s. The noise is from the clutch plates in the limited slip diff gripping and then releasing, it's trying to do its job as the left wheel is moving quite a bit faster than the right wheel. I believe the right fluid to resolve this is BMW Differential Fluid 75W-140 SAF XJ. It has friction modifiers which allow the plates to slip more. If the replacement fluid doesn't have the right amount of friction modifiers the noise will remain. It's kinda expensive.

I should also note that if you also understand that by enabling the plates to slip more, it is actually lessening the effectiveness of what the LSD was meant to do in the first place, which is to transfer torque back across to the axle that is not rotating. Most people just want the noise to go away and don't really care about the how well the LSD is able to transfer back torque.
 

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Giulio,

Welcome onboard and I hope you are enjoying your 'beast'. I've had my E63 M6 for about 9 years and it takes getting used to its querks. I have not had any major issues with it because it is maintained and serviced regularly. The diff oil change should hopefully sort out the rear end clunking noise. I eventually swapped out the SMG for a manual tranny and it's a much better driving experience.
Thanks for the welcome, I am loving my beast! Slowly getting used to driving such a car around the crazy streets of London! Can't imagine what it is like to drive a manual E63... wow!
 

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The clunking or groaning noise on low speed right hand turns is a well known issue on M5s and M6s. We all have the same rear diff. I have it on all 3 of my M5s. The noise is from the clutch plates in the limited slip diff gripping and then releasing, it's trying to do its job as the left wheel is moving quite a bit faster than the right wheel. I believe the right fluid to resolve this is BMW Differential Fluid 75W-140 SAF XJ. It has friction modifiers which allow the plates to slip more. If the replacement fluid doesn't have the right amount of friction modifiers the noise will remain. It's kinda expensive.

I should also note that if you also understand that by enabling the plates to slip more, it is actually lessening the effectiveness of what the LSD was meant to do in the first place, which is to transfer torque back across to the axle that is not rotating. Most people just want the noise to go away and don't really care about the how well the LSD is able to transfer back torque.
Thank you for the reply- the noise doesn't bother me too much, as long as I know it's normal! Interesting point re the torque transfer.
 

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I just have a hard time believe you chaps buzzing around London given the price of petrol and paying the congestion tax. Love it!

Just make sure the diff fluid is properly topped off, the grunt/groan can also be due to lack of oil.

In performance driving situations, you actually want that inside wheel to regain traction and torque. I believe the LSD unit is the exact same unit in the E46 M3, (maybe E92 M3 also). Those plates do wear out over time but "aren't serviceable" according to BMW. There are folks that can rebuild the clutch pack. I recall there is a well known specialist in the UK that does this. He should be able to comprehensively address anything related to diffs for you.
 

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I just have a hard time believe you chaps buzzing around London given the price of petrol and paying the congestion tax. Love it!

Just make sure the diff fluid is properly topped off, the grunt/groan can also be due to lack of oil.

In performance driving situations, you actually want that inside wheel to regain traction and torque. I believe the LSD unit is the exact same unit in the E46 M3, (maybe E92 M3 also). Those plates do wear out over time but "aren't serviceable" according to BMW. There are folks that can rebuild the clutch pack. I recall there is a well known specialist in the UK that does this. He should be able to comprehensively address anything related to diffs for you.
Driving around London is hard enough but I have to say the M6 is tricky in traffic, the constant rolling back and forth with the SMG box can be a nightmare but I guess I have got used to driving full automatics as I find driving a manual in London very unpleasant! Average MPG is around 9-10 but not the worst...!

I long for wide open American highways!
 
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