Me too. But caught sight of a recommendation 10-60 for racing ferraris which is what I put in my "racing" (haha) HF!
Tim
Tim, I think you may have to read a little more as there are a few recommendations and as ever 'it depends' as far I could understand (yes I did manage to read most of it before going for a coffee break).
It is a shame it is written in such a long winded and serious, text book style as the points he is making are quite interesting, especially the comments about oil going off just standing around in the garage/engine, and the issue when starting from cold about using a lower viscosity (at low temp) mixture to reduce startup wear on the engine.
Also the test at the end makes the whole thing feel like a pre run to a published paper for academic use.
Anyone fancy producing a summation in say 20-40 lines?
Peter