They're all much of a muchness. I use Lucas Oil Stablizer (their Z) in a tired 1960s classic. Do about 4-5000 a year with it, and it works. Is it right, is it a good thing? Nope, and I'm sorry no snake-oil is going to make-up for lack of metal. But it solders on. Be clear, it's a bodge, these snake-oils all do the same thing in the same dubious way. What else did you want us to hear? I can say, Lucas Oil Stablizer does seen to stop oil wobbling, which is good.
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When I bought my 70R it had 152k on the clock and the oil hadn't been changed for 9500 miles (I don't care what Volvo say, it should never be more than 5k on these engines!).
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Respectfully... utter rot: And here's proof... proper oil analysis at 28,000. You're wasting money. The PCV clogs for others reasons I've covered. Get your oil labb'ed and see for yourself. You'll spend less on a lab than you're spending on oil.