Hello,
I am aware that these additives are not really Volvo recommended but i am just curious if anybody has tried the sea foam injector cleaner and and Auto RX oil additive? Reason i am asking is when i put in the sea foam injector cleaner my gas mpg went up to an additional 2miles(w/c is good) but for some reason at the end of the day my cat converter broke? (w/c is a bomber!!) I am not sure if the additive has got something to do with the cat breaking down or just a coincidence.
Thanks
94 850 wagon n/a 190K
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