The only thing I found lacking were the OEM brakes. I upgraded this once I started with the HP upgrades. I added an Alcon 6 piston set.
I run LiquiMoly Top Tec 6200 0W-20 and have for years. Currently on Stage 2 91 Octane 2019 B9 S4. No problems at all.
I use the LiquiMoly in my S4 but regardless anything that meets the spec on the list is probably fine.
I used that in my B7 Audi S4. Great choice. It’s good stuff.
Clear-corners are the only way to go on B5's. They just look so damn good, and new ones do an incredible job of freshening-up the front of the car. Makes it look years newer.
There are two choices, genuine OEM units like European B5's got, which were made by Valeo.
And aftermarket replica units made by Depo. The Valeo units are worth the price difference in my opinion.
To be honest, the mobil 1 ESP 0w-20 is a fantastic oil and meets those specs and is at walmart for $8/qt
M1 ESP is arguably the best oil out there. It does not shear fast, doesnt degrade with 5% fuel dilution.
I remember on my S4 the water pump had a plastic impeller that was guaranteed to fail at some point. The aftermarket made one that was metal.
I recently bought a 2007 S4 and just went through the process of getting it Maryland inspected. Long story short, I needed to replace the right passenger headlight due to an issue with the headlight assembly. I bought [this](https://eeuroparts.com/product/magneti-marelli/LUS6751) OEM headlight and had it professionally installed at a mechanic I know where he transferred the old ballast and bulb into the new assembly. The installation was successful and it passed inspection, however, every time I start the car the adaptive light warning symbol pops up and continues to flash until I turn the car off again. Erasing the code with a scanner doesn't help and the mechanic I brought the car to didn't know how to fix it.
My 2022 s4 water pump failure at 42000km. Lucky it was under warranty. This is probably the last Audi I will buy. The quality sucks.
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