In article ,
Andy Burns wrote:
Chris Hogg wrote:

I always thought the smell of the exhaust of high-performance engines
such as in sports and racing cars at hill climb meetings etc was due
to the use of 'Castrol' somewhere in the fuel mix (whatever Castrol
was)

"Castrol R" based on castor oil.

which explains the name.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle