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This is an RCZ forum but I'm sure someone will know.
I recall one of my previous cars had numerous oil grades recommended. One by Subaru, one by Toyota and the other by owners.
https://tafmet.pl/english/egr-valve-blanking-plates/502-egr-valve-blanking-plate-for-citroen-peugeot-ford-dw10cted4-20-hdi-tdci-140-163-hp-euro-5-engines-5902553471120.html#:~:text=The%20EGR%20valve%20is%20located,the%20front%20of%20the%20engine.
Do the pictures make any sense here?
My...