Is this the right fluid for my stock A4. Speed Inc. has it and I'm thinking about using it. Will it hurt if the royal purple fluid is mixed in with my current fluid. I'm only going to drop the pan when changing the tranny fluid instead of flushing it. So there will be some of the other fluid left in there.

 

You can mix synth fluids with regular fluids. And I swear by RP. I ran 10s for a year and a 100 mile open road race and when we tore the tranny down the clutch packs still had the silk screen lettering on them. Never slipped, ran cool, shifted hard.....I'll never use anything else.

 

Works fine in my A3

 

I recommend dexron III

brand name, valvoline, castrol etc.