Calm down a bit. In reviewing the service book, the shops are writing "Kendall 15W40" with no indication of GT-1, SHP, etc. In fact both of the dealers tag the same way. The receipts are no more informative. The price has increased over the years from around $2.20/qt to $2.76 on the last service. Does not sound like synthetic pricing to me.

Her prior diet was Castrol GTX 20W50.

Regarding suing the shops, I should consider a suit for only lasting (however many miles she eventually has on her at failure) miles versus (please supply mileage here) miles.

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https://goo.gl/photos/J8ZUVvAYiYqLxbD18

1989 560SL 111Kmi
2007 E550 4Matic 157 Kmi
2000 F250SD 7.3l, 1996 Explorer Ltd 5.0l
1965 VW Beetle Deluxe 115 Kmi
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Previous MB:
1983 240D Euro Manual 144 Kmi
1983 300SD 495 Kmi
1986 190D 2.5 100 Kmi
1986 300SDL 202 Kmi
1991 300D 2.5 Turbo 91 Kmi
1998 E320S4 (4-matic wagon) 140 Kmi