which oil??

some motorists swear by their favourite blend of engine oils........ and so they say they can feeeeel the difference....

a blind test should settle things in a clearer manner.....

frankly speaking, i cant tell much of a difference from the tried and tested buttometer....... 

i cant even tell if i was using octane 98 or 95 fuel...... somehow both seem to perform equally well.......

can you?