My Dyson Analysis kit arrived yesterday. A bit of a letdown actually. A box, a bottle and two stickers. I was expecting a bit more for $50 US. Nevertheless... My province (Ontario, Canada) has recently changed its emissions test laws (again). I thought my '91 Integra was going to be free-and-clear and exempt from smog after the next two tests, but it now appears it will be shackled forevermore. As a consequence, suddenly I'm acutely aware of my catalytic converter, which is original, has 264,000 miles on it, appears to be working fine, and costs $1,100 to replace with OEM. The last thing I want to do now is feed the cat fuel or oil that might contaminate it. And I understand HM oils (like the HM Castrol GTX I was considering) contain additives that *may* damage the cat. I have observed that GTX HM lacks the API starburst symbol and is not GF-4 certified (obviously). I am asking here for assurances that the organo-moly, ZDDP, sulfur or whatever it is that HM oils use will NOT cause damage to my elderly cat. Any help?