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It’s rust. You need copper lines. American Grease Stick - available at Advance Auto. Good product. You can bend by hand - carefully, but doable. I used this on both an e38, and a r53.
 

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It’s rust. You need copper lines. American Grease Stick - available at Advance Auto. Good product. You can bend by hand - carefully, but doable. I used this on both an e38, and a r53.
For sure you will need the line to that junction, and a new flexible line. Look at the rest carefully - that won’t be the only rust ( in most cases ). COPO Nova? What year?
 
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