Very interesting to read about the Lewin Spittle Midget; clearly a lot of fun. However, it may not be out of place to mention that we have never advocated the mixing of Castrol R40 with any other mineral-based oil.
We know that R40 is often used in the petrol to add “aroma” but “separation” could follow its addition to crankcase oil.
Many thanks for a splendid magazine.
Pangbourne D. W. BONNER Product Development Automotive Burmah-Castrol Company