Originally Posted by strat61caster

He means two stroke oil which gets poured into the fuel tank before fill up.

Note that these aren't "fixes" per se, rather band aids so your car doesn't make noise, and they aren't guaranteed to work, members have reported both that the two stroke oil and E0 did not get rid of the chirps, they are the minority but take everything with a grain of salt.

The car was supposed to be designed to run on readily available fuel, changing the fuel you put into the take doesn't 'fix' anything. The design chirps, it wasn't enough to bother me (believe me, many would be complaining with the noise I "suffered" so I wasn't one of the lucky ones) so I left it alone, after 10k miles it went silent, just crossed 16k trouble free miles.