After doing hours of reading on BobIsTheOilGuy, I've realized all but a handful of "full synthetic" oils are actually dino based. Including Mobil 1 and Rotella T6(what I currently use).
I'm only interested in group v and up.

Being that soot is the limiting factor for our older engines, is there really a point of using something like Amsoil Signature series oil?

https://www.amsoil.com/shop/by-product/motor-oil/diesel/signature-series-max-duty-synthetic-diesel-oil-15w-40/?code=DMEQT-EA

https://www.amsoil.com/shop/by-product/motor-oil/diesel/signature-series-max-duty-synthetic-diesel-oil-5w-40/?code=DEOQT-EA

The soot levels would cut it off short long before we can get the most out if correct, even for the newer 60x engines right?

Curious because I was considering buying this stuff.

Edited botched title

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.