Oil brand recommendations are as varied as there are FC3S owners - ask a
different FC3S owner and you can get a different answer. Stick with
quality, name-brand oil and you cannot go wrong. Castrol GTX (20W50)
is recommended by Mazda for their reman motors. It is more important
to stick with a religious 3,000 mile oil change schedule than debating which
motor oil brand is better.
turbos, it is recommended to stick with 20W50. If you want to use a
lighter weight oil, you can use 10W30, but for those who run their cars hard,
20W50 is recommended for better oil protection due to being thicker. It is
not recommended to use 10W40 weight. For a full explanation why, check out
the Oil FAQ for further details.
As for synthetics, there are conflicting arguments for their use. Yes,
they give better protection, especially for turbo engines, but due to the
oil-burning nature of the rotary engine, it is not recommended for street
use. We've found that synthetic oils produce higher amounts of deposits
on the rotor housings, especially right around the spark plug holes. For
this reason, using good, quality mineral oil with 3,000 mile oil changes give
more than enough protection for your FC3S on the street.
For those who have eliminated the stock oil injection system and
pre-mixing, we wholeheartedly endorse using synthetics - very little is burned
in the combustion chambers.
Click here for the Internet Oil FAQ!
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