It kind of looks like the silicone thing they use to stick the oil pan to the engine, the ultra grey thingy. Maybe previous owners had to remove oil pan for some reason, and part of the scrapped glue was left inside? Long shot here btw....
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FI Non-Res Test Pipes | FI 18" Res CBE | Stillen Gen 3 CAI | Dynotuned @ Dynosty EcuTek 325 whp
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