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When the 991 GT3 came out, there were some cases of engine fire. I read quite a bit about it, and it turns out some techs were wiping the engine after reinstalling the drain plugs and forgetting the oil soaked rags in there after closing the underbody panels
might have happened a few times? it wasn't the source of the engine failures though. connecting rod through crankcase is why they all got extended engine warranties.