In August 2006, Mazda announced that it would recall its 2004, 2005 and some 2006 Mazda RX-8s due to a miscalculation with oil metering of its RENESIS engine.
Mazda reported that this had led to the engines in some RX-8s to experience problems with severe power loss and rough idle, most notably in warm climates and those exposed to high traffic conditions.
Mazda�s recall allowed the models to be tested for the power-loss problem, and that all engines that failed a vacuum test were replaced at no charge, even if the car was out of warranty.
The replacement engines also corrected other issues ranging from flooding, hard starting and complete loss of compression. Mazda said that only about 1% of the RENESIS engines needed to be replaced.
However, on all the vehicles that did not require an engine replacement, Mazda said that the ECU was reflashed to provide for more oil injection at idle and under low rpm driving.
Under the recall, the catalytic converter and leading spark plugs were also checked and replaced as needed. Mazda then extended all recalled vehicles� drivetrain warranty to five years/60,000 miles.
It should be noted here that full synthetic oils should not be used in Mazda rotary engines, which have unique and specific lubrication requirements. Always check the vehicle owners manual.