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Thanks for the suggestion. I found a VOA of RL 5W30 from 2004, and the Si was at 17, so that lines up well with the 16 you found.

Redline 5W30 in a 1981 VW Rabbit Diesel (non-turbo). 33K mi on rebuilt engine. Fuel is 100% biodiesel (with an occasional few gallons of petrodiesel in the winter to prevent gelling). Oil has 9300 miles on it with a filter (Mann) change at 5000 mi. A total of 2 quarts of makeup oil were added...