IanH's 955hp V10 Audi RS6 - Another Car Diary!

[IanH755]

Throttle Body - New one arrived, I'll fit it tomorrow

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Over winter I've been having a few issues with the cars battery getting very low if I didn't drive it every 2-3 days which was unusual. This low voltage causes the car to throw up some "quiescent current" faults, where the cars ECU's will gradually shut down sections of the car to keep the battery alive as long as possible (through 6 different stages of shutdown) and this can cause weird sensor errors, especially ones which are sensitive to voltage fluctuations (I was getting a few for powered seat modules etc). So today I checked the old Yuasa battery I'd fitted about 6 years ago I think (its outside warranty by now) and a few cells were degraded so it was struggling to hold charge and needed replacing.

I popped into Halfords for another identical one (Yuasa battery HSB020 - 5 year guarantee) and got a nice 20% discount from my old Trade Card, otherwise it'd have been £190 which is scandalous if you ask me!!!! Afterwards, as the cars ECU's had been been monitoring the slow degrade of the battery and they remember how poorly performing that battery was (and will pre-emptively adjust power levels for the bad battery), it now needs to be told that a new fresh battery is installed otherwise, yet again, it'll throw various error codes. However that was just a simple 5 minutes on my VCDS laptop where you change the serial number of the current battery to the new one (it needs to know the make, model and S/No of a bloody battery!), which tells the cars ECU's "hey this is a new battery, reset your power limits memory".

[IanH755]

A few smaller things - Fitted the new throttle body a while back and all is good there, popped into MRC Tuning in Banbury during a weekend trip back to Stoke for an oil change (Fuchs Titan Race Pro-S 5w30). When we filled in my service book we realised it'd been over a year since the last service so got to get it booked in for a "minor" service in a few weeks time inc gearbox service/oil cx on top.

[trickywoo]

IanH755 said:

A few smaller things - Fitted the new throttle body a while back and all is good there, popped into MRC Tuning in Banbury during a weekend trip back to Stoke for an oil change (Fuchs Titan Race Pro-S 5w30). When we filled in my service book we realised it'd been over a year since the last service so got to get it booked in for a "minor" service in a few weeks time inc gearbox service/oil cx on top.

Is there a particular benefit to running 30? I’d be a lot happier with 40 for the power you are running.

[IanH755]

I ran Fuchs Pro-S 5W-40 for years based on an OpieOils discussion and the last time I was at MRC they gave me a lengthy chat as to why I should go back to 5W-30 but it was about 18 months ago so the specifics of the chat are hazy at best but I "think" it was something about the oil pump flow rates and/or seals - I'm really struggling to remember the chat TBH, my take-away was "go back to 5W30" is all I remember clearly.

Worst case I can swap back to 5W-40 if needs be.