IanH's C6 RS6 - 955hp & 1200nm - Updated 09 Feb '24

[discostu49]

Any diagnosis on how it broke ?? Got me all worried about mine now lol

[IanH755]

Excessive power

The company doing the rebuild reckoned it was still on the original 100K mile oil based on it's condition which, combined with the extra power, killed the input bearings but they binned the oil which is a shame as I was going to send it away for analysis for proof of it's age before taking the matter further.

[don0301]

What is the consensus on how often to change the gearbox oil on stage 2?

Seem to get different views from the "Specialists"

I only do 3k ish a year....

I changed mine when i purchased it 2 years ago as a precaution at 77k miles.

It did seem to make the shifts etc smoother.

[IanH755]

I know MRC recommend every 20k miles.

[TomRS]

Very interesting catch up read this...


Been really busy last few weeks so good to read about all your woes ian! its not just me eh!

I am curious about your diff though, not good... i think i'll be putting some uprated esther synthetic oil in mine, what is the grading on the oil in the diff? 75-90 obviously shock oil as it has a form of LSD.

I really want my front diff oil changing but the oil from Audi is over £150 per litre and you need 2 litres.... i also cant really find any proper information on what oil it actually is to replace it with something else.

[IanH755]

I'll be swapping my OEM Audi 75w-90 diff oil to an Ester based fully synthetic from Motul - Gear 300 75w-90 (front/rear diffs) and Gear 300 LS (transfer box) at it's servicing next month.

So the plan for early September is a 10k servicing, GB service, all diff's and fix the leaky OSF DRC pipe in the arch which has sprouted a little leak (re-pressurise the DRC too) all done at Unit20.

[bam_bam]

Do you still live in Kent? That's a 9hr round trip for a service at U20, wow.

[IanH755]

I'll be back in Stoke that week to see my mates new born sack of crap, vomit and tears so I'm only an hour away.

I hate babies.

[bam_bam]

Really, I couldn't tell...

[IanH755]

Yay got my car back with a new rear diff and the AP Racing 410mm Radi-Cal setup with custom braided brake lines.

Boo the brakes need more bleeding as the pedal feels too soft, even though the brakes work.

[IanH755]

Brakes re-bled (got some air out) and pads bedded releasing a vast quantity of smoke and the brakes are stunning!!!

I'm hitting the tyres grip limit at *well* above motorway speeds which is much better than before where it braked strongly down from high speed to 70mph-ish before starting to chirp the tyres.

Now I just need to sort the knocking from the OSF DRC strut which is still leaking at a union in the arch.

[IanH755]

So then, TLC time!!!

I've been buying a few bits just to sort out some of the cosmetic issues I have from it being a 100k mile daily driver -

* Fitted a new front splitter to replace the badly battered and bruised one which the previous owner had glued 2 Laser Jammers too. During their none too subtle removal by MRC (think chisels/screwdrivers were used) the plastic splitter was scratched to pieces and cosmetically wrecked. Simple job to replace, 5x Torx bits and some trim poppers, took about 15mins after I'd got the car jacked up after Tea.

* Changed the license plate holder screws (rusted) & broken plastic protectors for a new set.

* Tomorrow I'll be fitting a new engine undertray, just need 15 1/4 turn fasteners from Audi - no point fitting old rusty ones.

* Friday is the 10k service at Unit20 and DRC re-pressure and I'll also get some pics of the new brake setup too.

* Found some rust in the NSR arch which needs sorting before winter starts.

But mostly I spent the day cleaning my old brakes ready to sell on eBay. Now as anyone whose changed a set of brakes will know, they're absolutely filthy and after a few hours in the lovely sunshine sweating away and wiping bugs from my face I must have looked a right sight to the poor Fed-ex man when I, a stocky (fat) 20 stone 6ft ex-military rugby player with his face all blacked up like a navy SEAL, surprised him at the door just before he could knock. It would probably explain the parcel he dropped and the little squeak he let out

The cleaning rags filled a 35L bin to make them look that good, they were filthy! It was mainly the calipers with 100k miles of baked on grime!

[IanH755]

Busy day up at Unit20 in the Wirral -

10k Servicing
Gearbox Service
Rear Diff Oil re-fill
New engine undertray fitted
Front suspension arm noise located (to be dealt with next month)
DRC suspension leak found (to be dealt with next month)

Other than the servicing bits, we found that the creaking/clunking noise was from the suspension arms and that the DRC leak, which was a slight weep a month ago, has now stopped (yay) but the flexible pipes are very badly corroded and need replacing before it can be re-pressurised (boo) so, with 100k miles on them, it'd be rude not to replace the struts at the same time for a complete suspension refresh (yay-me/boo-wallet).

[IanH755]

Awesome weather today!





Found a lovely church but forgot to change my exposure so the brickwork got bleached out



and a quicky of my new brakes

[NotNormal]

They look impressive Ian, immense stopping power