I think this is correct. Mazdas "special" rotary oil Dexelia is castrol gtx.
RX 8 ENGINE OIL
- Thread starter the_rx8_guy
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Most modern twostroke oil addresses the demands for
the rotary.
-Clean burning(low smoke)
-No deposits(exhaust valve, rings)
-Withstand high operating temperatures(not "outboard oil")
-Withstand high piston speeds (hi perf 2 st)
Does a rotary have an oil sump like a fourstroke or is it
lubricated by oil in intake?
the rotary.
-Clean burning(low smoke)
-No deposits(exhaust valve, rings)
-Withstand high operating temperatures(not "outboard oil")
-Withstand high piston speeds (hi perf 2 st)
Does a rotary have an oil sump like a fourstroke or is it
lubricated by oil in intake?
Here is an aircraft website with lots of info. Maybe you could find something here:
http://www.rotaryeng.net/
http://www.rotaryeng.net/
There were quite a few reasons for early RX-8 engine failures.
One of the ones not discussed yet was a poor water pump design, that lead to cavitation at high engine speeds. So, a really high temp operating engine combined with high rpms, plus a water pump that doesn't do its job properly at those speeds = dead engine.
There were other items, like the fact that Mazda had given the engine a lower pressure oil pump, which lead to bad bearing wear on the eccentric shaft (think crankshaft). Any amount of extra play in a shaft spinning the rotors lead to excessive housing wear, which leads to compression loss.
They also gave the rotor housings only 2 oil injectors between '04 and '08, where as the previous rotary engine had 3 oil injectors. They brought back the third oil injector for the '09 through '12 years (Japan gets the 2012 cars, not the US or EMEA countries). Combined with too little oil during the '04 and early '05 cars, rotor housing wear lead to lots of early failures between '04 and '06.
If you pick up an '09 or newer, 5W-20 is perfectly fine for the engine. Some still prefer to use heavier oil, but I'm not really one of them, unless its a track day.
But the biggest cause of failure for the engines was due to the weak stock ignition system. The coils loose their ability to provide enough juice to the spark plugs anywhere between 20k and 40 k miles. Once the engine starts misfiring, damage can be done either very quickly if you still try to run the engine up to 9k rpms all day every day, or after a period of time if you're a more sedate driver, commuting back and forth to work all the time.
Also, the failed ignition coils commonly lead to the death of the catalytic convertor in a very short period of time. They don't like being doused with unburned fuel, only to light it off randomly.
BC.
One of the ones not discussed yet was a poor water pump design, that lead to cavitation at high engine speeds. So, a really high temp operating engine combined with high rpms, plus a water pump that doesn't do its job properly at those speeds = dead engine.
There were other items, like the fact that Mazda had given the engine a lower pressure oil pump, which lead to bad bearing wear on the eccentric shaft (think crankshaft). Any amount of extra play in a shaft spinning the rotors lead to excessive housing wear, which leads to compression loss.
They also gave the rotor housings only 2 oil injectors between '04 and '08, where as the previous rotary engine had 3 oil injectors. They brought back the third oil injector for the '09 through '12 years (Japan gets the 2012 cars, not the US or EMEA countries). Combined with too little oil during the '04 and early '05 cars, rotor housing wear lead to lots of early failures between '04 and '06.
If you pick up an '09 or newer, 5W-20 is perfectly fine for the engine. Some still prefer to use heavier oil, but I'm not really one of them, unless its a track day.
But the biggest cause of failure for the engines was due to the weak stock ignition system. The coils loose their ability to provide enough juice to the spark plugs anywhere between 20k and 40 k miles. Once the engine starts misfiring, damage can be done either very quickly if you still try to run the engine up to 9k rpms all day every day, or after a period of time if you're a more sedate driver, commuting back and forth to work all the time.
Also, the failed ignition coils commonly lead to the death of the catalytic convertor in a very short period of time. They don't like being doused with unburned fuel, only to light it off randomly.
BC.
I remember working with one Mazda RX-8 (I think it was a 2004) where the engine wouldn't start because the compression wasn't even close to the minimum number. He had about 138,000 miles, and he used Pennzoil Conventional for the life of the car and changed it every 3,000 miles.
It is why I recommend avoiding those cars.
It is why I recommend avoiding those cars.
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