https://ntrs.nasa.gov/search
Lots of aviation stuff, all you need to do is search for your favorite military air craft, space ship or frankly just about anything. Lots of SR-71 and U-2 stuff. Some of the documents even go back to 1920's.
Not to be confused with Champion oil filters. Bought this stuff off Amazon, you can still find it listed for $13 for a case of 12. It's listed as 12 quarts and 384 oz, but shipping weight is usually 2 lbs. I scored 6 cases at different times, sometimes they only ship 1 quart. If you complain...