OK, sorry about the sensitivity.I’m not getting nasty by any means, I’m just trying to tell you that what I knew before I left Audi was that G12evo was not backwards compatible.
I understand that was your understanding when you left Audi. But every single thing I'm seeing now (official VW/Audi and otherwise) addresses the backwards-compatibility of progressive VW/Audi coolants, saying they are backwards-compatible.
Here's a non-official example regarding G12evo from the UK:
G12evo Engine Coolant 1.0 Litre (G13): G012A8GM1 | Heritage Parts Centre EU
"This is the latest coolant from Volkswagen and supersedes G13 and G12 coolants. Will mix safely with all other VW Coolants (G11, G12, G12+, G13)."
The Brits wouldn't lie...
I'm just asking whether you can find a single reference that says otherwise (that we can check)... Coolant compatibility is critically important (as we found out when G11 switched to G12 in ~1997). If you're making an assertion, you really do need to provide evidence... Kind of like a footnote citation...
Annnnd, I've got some more coolant comments/questions.
First, note that the VW TB that GTI's linked to...
19-17-01 - Identifying and Mixing Volkswagen Engine Coolants (U.S. Only) (2022548) (nhtsa.gov)
...confirms what the local VW parts manager told me... The only engine for which VW still sells G13 is the 2015 TDI (CVCA and CRUA).
Second, understanding that VW and Audi say that G12evo is backwards-compatible, there's the note that it'll turn G11, all the G12s, and G13 brown. When I saw that, it just freaked me out, based on past experience with what happens when VW coolants turn brown...
As it happens, the rear main seal blew out last December on my 2009 GLI (TSI engine). As part of the work, my trusted and knowledgeable indy shop flushed and refilled the coolant system. I just checked with them, and sure enough they used the newest G12evo. And, sure enough, despite the flush, my coolant is now cloudy brownish (which VW says is OK):
That's in stark contrast to the nice clear electric-pink G12++ that's in my wife's 2009 2.5 Jetta:
If I didn't know about what G12evo is supposed to do, I'd be hopping mad now...
Third, anyone know why VW/Audi went backwards in their designation numbers with G12evo? Why not G13+, or G14?