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Re-read my last post. I edited it.Well the sealants you mentioned aren’t recommended for plastic according to Loctite and Permatex. Also, the o-ring does the sealing. I’m thinking the red shjt is more of a locking to keep the tube from spinning.
516 is what he is looking for, never seen consumer sized packages.Red threadlocker on a plastic oil fill tube? Not a chance.
It's thread sealant. I don't think anyone can tell you with absolute certainty the brand of the thread sealant. But, as long as it's compatible with engine oil, should be good to go.
Loctite makes Loctite DRI 516 and 517 thread sealants. They resemble the same burnt orange color. Not sure if they are sold in consumer-sized containers though.
My oil fill tube unscrews before the cap does.
The tube is stripped and the valve cover is bent, looks like somebody tried to pull them selves up into the engine bay using the tube as a grab handle. Bunch of clown owned this truck previously… smhI had one on a LT1 like that. Used a pair of channel locks to screw the tube in after cleaning the threads putting the white teflon thread sealer on it. Stayed in place the rest of the time I owned that engine.