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I know lots of guys who used that write-up w/ success. I replaced mine w/ new back a few years ago and have since ditched the entire OMP.
S4 cars w/ manual OMP can get away with it... but the S5 is electric and if you ditch it, the stock ECU flips out and goes into LIMP mode big time...
In all honestly, if you have the S5 - I'd still run a little premix, just to be safe.. I run premix even in the 8 because I never have nor will trust mazda's decision on how much oil to inject. They have to care about EPA laws... I dont care about EPA (sorry mother earth)
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