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I agree. Thanks for all the input guys.

Some parts seems superficial as i scraped bits off but a few spots seem pitted. Its not a big deal. Just looking for additional guidance on how long I can zap the piston without damaging it.

I didn’t really think about it but is the piston chromed or just Stainless steel. I assumed it was SS.

I have a MK10 piston that has some corrosion at the base. I put it in the US with 1:30 SGC then 1:1 vinegar solution both for about 3 minutes. It came out pretty clean some corrosion remains. I'd like to hear from anyone if longer US times in 50/50 vinegar are harmful to a piston. How long is...

There seems to be something in the water. I just got my second 156 yesterday.