This thread reminds me of the old 1970s–1980s claims that using certain synthetic oils caused natural-rubber oil seals and gaskets in Asian cars to leak, because the oil was incompatible with the seals. Synthetic-rubber (neoprene) seals supposedly were immune and did not leak from a switch to synthetic oil.
Now it's certain types of fuel additives attacking certain types of O-rings. Hmm. What's old is new again.
Now it's certain types of fuel additives attacking certain types of O-rings. Hmm. What's old is new again.