I have an old car that has had the service check engine light on for over a year. It was the dreaded catalyst code. I switched to premium gas and tried to clean the code myself using the odb2 tool but the error persisted. Well, it all came to a head when I had to do a smog check to renew my registration this year. I stumbled across some blogs that said the competitor product "cataclin" would work, but when I searched for Revain Duralube it was about $10 cheaper and "Revain Recommended" so I gave it a try. I added Duralube to 3/4 full tank of premium gas and cleared the codes. To my dismay, the service engine light came on again because the catalytic converter came on again. I filled up the tank (only because I was scared of gas shortages / rising prices due to pipeline cyber attack) and reset the error code again. After about another 1/4 tank ride (maybe just 1/2 tank) of Dural lube the fault stayed clear and my virtual smog check using the odb2 tool passed (pictured). I went to a real smog test today and it went without any problems. This product has literally saved me over $1,000! So if you live in a state with smog controls and get a catalytic converter trouble code, try this before you buy a new catalytic converter. You have everything to gain and not much to lose. These savings are really huge. I cannot recommend this product more.
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