IMO (and note that I'm no chemist) modern b/c catalyzed paints don't give up/absorb "oils". You might get some temporary benefit on a horribly dried out/near-failure paintjob, but generally *IMO* the whole "replenish the oils" bit is [not valid] on today's paints. And bythe same token, I don't put much stock in worries about "drying out" modern paints with stuff like Dawn/IPA/etc. either.
That's not to say that filling the pores/micro-fissures/etc. with such products won't improve the appearance, so it's not like there's never any benefit from using such products. But on a great-condition paintjob with no/minimal surface defects, I never see any advantage. Putting
Meg's #3/#5/#7/#81 on a perfectly prepped new Audi was a complete waste of time for me- the stuff went on and came off without improving the appearance a bit.
Single stage (especially older paints, and *especially* old lacquer) can be a whole 'nother ballgame, and these really *can* absorb, and benefit from, the oils; that's what they designed those types of products to do and they work well *for that application*. The proper use of something like #7 on certain single stage paints can produce some jaw-dropping results, just beautiful. Yeah, old dried-out lacquer really will absorb oils and achieve (somewhat short-term) rejuvenation; I used these products extensively back in the day (before b/c paint) and I've done it more recently (and quite dramatically) on a neglected '75 Jag using #7.
But there isn't all that much in common between old lacquer and today's automotive paints, at least not that I can tell. Gotta watch the generalizations, things change.
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