1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

why no synthetic oil??

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Old Sep 30, 2002 | 01:55 PM
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Hyper4mance2k's Avatar
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Question why no synthetic oil??

i've heard that you should never use synthetic oil in a rotory. Why, why, why? i was a quart low today and mobile 1 high mileage20-50 full synthetic was all i had so i had to put it in and the car has never ran that smooth can someone give me a good reason or put an end to the myth. if thats what it is??
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Old Sep 30, 2002 | 02:16 PM
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Not sure but I have heard that it will cause carbon buildup and clog cats.

peace
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Old Sep 30, 2002 | 02:47 PM
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I have been yelled at numerous times for running synthetic oil. It has to do with the fact that the rotary oil is designed to burn small amounts of oil. Synthetic oil is designed not to burn. kinnda clashes. I guess in theory the oil will gel up and build up on the Apex seals. im goingto rebuild my motor soon and will be abel to tell if there is any nasty buildup
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Old Sep 30, 2002 | 03:38 PM
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basically your're right. Rotaries are designed to burn oil, synthetic doesn't like to burn, and when it does it turns to plastic that can't be good on the inside of your motor.
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Old Sep 30, 2002 | 04:58 PM
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yeah, and i guess it clogs up the oil injectors, i used to run it too untill i was talking to someone and they told me that i should be running regular oil. so then i just used some mmo for a week or so and got all the **** out i could, and then i switched to regular. but yeah it is bad for your car.
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Old Sep 30, 2002 | 08:31 PM
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Think of it as a 2 stroke engine, where you have to premix the oil and gas, the rotory engine (not all ) have
to have oil drawn in with the fuel and air, to lube the
seals at the corners,the nikki's were designed to add
oil to the intake, so it sorta premix's. the synth, oil's don't burn as clean as a ,,,( is it ? ) a fossel fuel oil ??
maybe,,it's important to check and change/add new,
or clean oil, because if your burning old beat up (black)
oil, that beat up ****, is what is being injected in the engine,I try to keep the oil in my 7 ,,as amber as i can.
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Old Sep 30, 2002 | 10:34 PM
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From: Wayward Hayward
So on my 12A can I block the oil injectors just like on my FC so I can run syn oil?
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Old Oct 1, 2002 | 02:04 AM
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I would guess so,if premixing is your bag.
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Old Oct 1, 2002 | 06:22 AM
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you can block off any rotary motor's injection system if you want to premix. however the guys at redline swear up and down that their synthetics burn clean and will not gum up in the motor.

being able to run low octane has nothing to do with whether it's a rotary or piston but what the compression of the motor is. ours is low enough that we can use a more potent gas.
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Old Oct 1, 2002 | 10:02 AM
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I have been running the redline synthetic for the last 15,000 miles (since I bought it) nd havent had a problem yet, but like I posted earlier im planning on rebuilding my motor here soon, and well see how it looks.
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Old Oct 1, 2002 | 11:54 AM
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OK guys,

This is straight from the Mazda engineers at Seven Stock this weekend........YOU CAN RUN SYNTHETIC!!!

Mazda tells you you cant because they designed the motors for approx. a 30k mile tune up........your plugs will foul with the cooler burning synthetic oils there for oiling the plugs.....nothing carbons, nothing clogs.....simply the plugs will foul in normal street driving over a period of time. I dont know about yall but I change my plugs about every 2hours of running time(thats autocross time).

This is straight from the factory!!!! They actually told us to start spreading the correct info on the net and tell everyone synthetic is the way to go!!!
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Old Oct 1, 2002 | 12:04 PM
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WHOOO HOOOOO!!!! I love my redline Synthetic, all $8.00 a quart of it!!!!
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Old Oct 1, 2002 | 12:32 PM
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Is that for any synth. or did the factory guys just say redline.
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Old Oct 1, 2002 | 01:06 PM
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No one specified any brand, although the Royal Purple rep was there. Racing Beat pushes that stuff pretty heavy. I personally prefer Redline!! my .02
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Old Oct 1, 2002 | 04:45 PM
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don't quote me, but i believe it was the castrol synthetic that originally caused all the probs. honestly, at $8 a quart, synthetic oil can kiss my boo-tay. seeing as i change the oil every 2k miles, i don't see the benefits of switching.
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Old Oct 1, 2002 | 05:00 PM
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wow lookie what i started
seemes like everything else auto motive noone really knows or has scientific fact to prove of disprove their hypothosis
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