That's the exact same method I used, twice, on some old trucks, about 30 years ago or so. Maybe we learned about this from the same source! (Hot Rod mag, perhaps?)
Very well could have been, I used that method before my apprenticeship.
We gained mosta our early knowledge from the monthly magazines, and adapted that to whatever make we were working on.
Personally, I'd run 20/50 like I do my high mileage Jeeps. 300k, 3 of em, - knock like hell for a coupla seconds every morning , - for years.
Cheers