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I’ve had my Silvia Pro X for several years now, and it started to develop this fuzzy mold on the pipe at the top of the water level sensor. As time progressed I would wipe it, but then it would come back and slowly the pipe started to yellow (as seen in the first picture). Now the rest of the pipes of some kinds of deposits, being brown in built up areas. What is this and what can I do to prevent it?

It’s a 1985 four door, manual. Seller says, “Needs an ecu, otherwise runs and drives. No rust. 2000$ OBO, willing to trade for whatever. Ask questions.” I don’t know if it has a clean title or not. Is it worth looking into buying, and if so what should I ask/look for?

Looks kind of like a 403, but it has slightly different toggle placement. Can’t seem to find if it’s maybe some foreign version or what it could be. Does anyone know?