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Old 02-23-2012, 04:46 AM   #1
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Thumbs up Synthetic or Regular

Depending on who I talk to, the answer is Synthetic or Regular..

I've heard that Synthetic in a rotary is a big no no, and I have also heard that it's good for our engines... Which one is it? What viscosity?

The engine is basically brand new and will be seeing about 10-13psi of boost..

Thanks!
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Old 02-23-2012, 05:42 AM   #2
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This has been argued back and forth since the forum started. There a plenty of people on both sides of the fence. You've been a member here for long enough to know better. Just go back through and read the many other threads on the topic and go with what you think is right for you and your set up.

This thread will just turn into a **** fest of people regurgitating the same info that they've read or posted in the older threads, people yelling search, and newbs adding their mis-informed 2 cents. That's my 2 cents anyway.
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Old 02-23-2012, 06:51 AM   #3
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Either oil is fine but synthetic is superior in every regard on an atomic level. It's pure physical science and I don't understand why some members refuse to believe it but synthetic will provide better lubrication. It also has less impurities to damage internal components such as the seals.

This thread will flood with everyone's opinion and experiences.

As for myself, I use Royal Purple 5W-20 for the slight increase in fuel economy since I drive 110 miles a day.

Using mineral oil has been proven to be fine in the rotary so you can't really go wrong either way. It's just that one is more "right".
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Old 02-23-2012, 08:01 AM   #4
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i use regular 5w20 only cause i dont wanna void my warranty. But if it was up to me i would use synthetic. Ive read numerous threads and ive become convinced that synthetic is the way to go.
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Old 02-23-2012, 08:35 AM   #5
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The only reason I never really invested in synthetic oil is because I'm strange about changing my oil every 2,000 miles on a rotary. And using synthetic would cost a lot more than some good old GTX. My own "personal" opinion on oil weight is 5w20 = trash. For the love of god you might as well spray some WD40 down the engine it will probably give you better protection than 5w20....

I personally run 10w40, maybe if I lived in Alaska I would consider something thinner like 10w30 or 5w30.

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Old 02-23-2012, 11:54 AM   #6
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I like how the only different oils they have grouped together are 5w20 and 5w30, so you don't see that 5w20 would only go up to about 100 degrees on that chart maybe a tad less.

I went 10w40 also after a whole lot of reading on here. It can hit 115+ degrees out here in the summer. I would rather run a 0w40 or 5w40 but I cant actually find that.

If someone wants to know more about oil than they could ever remember, check this out. http://ferrarichat.com/forum/showthread.php?t=136052 It has no rotary specific info, but it explains just about everything if not everything about oil.
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Old 02-23-2012, 12:28 PM   #7
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Which oil to use
The most debated question in the community, bordering on a religious war, so I won't try to cover every point here.

It boils down to deciding for yourself.

Some go with 5w20, to stay with Mazda's recommendation in North America. Some go with 5w30 to go with Mazda's recommendation outside North America. Others go to 10w40 or even 20w50, the most common weights among RX-7s. The general arguement revolves around if 5w20 is too thin or not. Typically, you want to go with a heavier weight oil (higher numbers) the hotter the environment you live in. Many manuals outside of North America state something to this effect. So research up on it, and make your own decision.

Dino vs synthetic is another hot topic, with the main arguement revolving around if the strength of the synthetic is worth the cost, and if there is any better burning (or not better burning) than dino oils, and if any deposits are left behind that could increase engine wear. Mazda only recommends non-synthetic, but does not require it. Your decision.


And yes, all weights of oils mix with all other weights of oils, roughly averaging the numbers. Half 5w20 and half 5w40 is roughly 5w30, for example. Not precisely, but close enough. Dino also mixes entirely fine with synthetic.
The short story is: You have to make up your own mind. Asking people is only going to increase the number of options you have to pick from, and in the end you are still the one making the decision yourself.
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Old 02-23-2012, 12:55 PM   #8
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One word. Idemitsu.
</Thread>
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Old 02-23-2012, 01:01 PM   #9
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One word. Idemitsu.
</Thread>
Exactly, run sohn with Idemitsu, then it doesnt matter what oil you use. End of another useless oil thread.
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Old 02-23-2012, 01:07 PM   #10
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I've had really good results with Aunt Jemima Syrup but I recently just switched to Blueberry. Gained like 5RWHP, verified on the DYNO, and my motor has 350,000 miles.
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Old 02-23-2012, 01:19 PM   #11
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idk why you guys keep fighting ofer this. just run some slick 50 in it, drain it out and you will be fine forever
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Old 02-23-2012, 01:30 PM   #12
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Formul8 Thanks dude lol
yeah i use pine sap...freshly pumped out of pine trees beside my house. sometimes its hard to start up but ive gained atleast 50whp and the smell my car leaves behind is a fresh scent of some natural pine
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Old 02-23-2012, 01:33 PM   #13
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My own "personal" opinion on oil weight is 5w20 = trash. For the love of god you might as well spray some WD40 down the engine it will probably give you better protection than 5w20.
Your "personal opinion" is certainly that - an opinion. But saying the 5w-20 provides no protection at all is quite a stretch.

My "opinion" is that the difference in viscosity between the 5w-30 and 5w-20 is not significant enough. Other variables such as poor maintenance habits and clogged oil injectors might be more plausible in regards to engine failure.

The correlation between higher viscosity and engine longetivy is also hard to prove. Some engines seem to fail regardless.

Finally, I cannot even imagine for one second Mazda would recommend 5w-20 in the US knowing such grade would harm engines - even if the primary goal was to pass emissions and fuel economy standards.
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Old 02-23-2012, 01:39 PM   #14
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I've had really good results with Aunt Jemima Syrup but I recently just switched to Blueberry. Gained like 5RWHP, verified on the DYNO, and my motor has 350,000 miles.


Try boysenberries.
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Old 02-23-2012, 01:52 PM   #15
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It's threads like this that just smear the mis-information around...
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Old 02-23-2012, 01:52 PM   #16
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Your "personal opinion" is certainly that - an opinion. But saying the 5w-20 provides no protection at all is quite a stretch.

My "opinion" is that the difference in viscosity between the 5w-30 and 5w-20 is not significant enough. Other variables such as poor maintenance habits and clogged oil injectors might be more plausible in regards to engine failure.

The correlation between higher viscosity and engine longetivy is also hard to prove. Some engines seem to fail regardless.

Finally, I cannot even imagine for one second Mazda would recommend 5w-20 in the US knowing such grade would harm engines - even if the primary goal was to pass emissions and fuel economy standards.
5w20 or 0w20 is in fact trash.

It exist simply because it would allow the engine to last until the manufacture warranty is over while giving a few extra % increase in mpg. And this applies to all kind of ICE, not just rotary.

Mazda is not stupid of course, but their marketing department is. We have such retarded mpg requirements that every one has to meet. And average americans sell their car when the manufacture warranty is over. So why is it sooo suprising that mnao pick an oil that would allow them to last long enough till the warranty is over?

Not to memtion if u want to argue 5w20 is good enough then you should explain why people that use 5w20 only is seeing abnormal stationary and rotor bearing wear?

Engine is just like everything else in life, some dies sooner rather than later. This engine seems to suck becuase every sigle people on earth is crying babies and whine about every single thing
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Old 02-23-2012, 01:53 PM   #17
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Try boysenberries.
love that stuff. now i want waffles or pancakes
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damn it 200, we told you HANDS off Habs' daughter!

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Old 02-23-2012, 02:00 PM   #18
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The only thing I can think of why they do not recommend the use of synthetic oils is maybe they do not burn very well and will plug up your ports over time. As a mechanic of almost 40 years I have learned that the manufacturer recommendations as far as oil goes is probably best for the equipment. After all they were the people who spent millions doing all the R & D that goes into engine building. Nobody knows more about rotary engines than Mazda, that you can go to the bank on.
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Old 02-23-2012, 02:10 PM   #19
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I like how the only different oils they have grouped together are 5w20 and 5w30, so you don't see that 5w20 would only go up to about 100 degrees on that chart maybe a tad less.
I'm not really sure why they were put together either. Makes me wonder....

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Your "personal opinion" is certainly that - an opinion. But saying the 5w-20 provides no protection at all is quite a stretch.

My "opinion" is that the difference in viscosity between the 5w-30 and 5w-20 is not significant enough. Other variables such as poor maintenance habits and clogged oil injectors might be more plausible in regards to engine failure.

The correlation between higher viscosity and engine longetivy is also hard to prove. Some engines seem to fail regardless.

Finally, I cannot even imagine for one second Mazda would recommend 5w-20 in the US knowing such grade would harm engines - even if the primary goal was to pass emissions and fuel economy standards.
I agree with all your statements, except the last one.

-Why is 5w20 only recommended in the USA?
-Do we have specially built engines compared to the rest of the world?
-Do we have a special climate that covers our entire country that no other part of the world sees, that would merit such a statement that only North American owners should use 5w20?

The short answer: US EPA
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Old 02-23-2012, 02:13 PM   #20
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Yay and another synthetic oil debate with a **** ton of misinformation.
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Old 02-23-2012, 03:50 PM   #21
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It may have more to do with CAFE than EPA but it may also be that Americans have a tendancy to drive longer distances covering a lot of climate change. They don't drive like we do in Europe. A 2000 km drive would be a huge trip, for us its just a couple of days on the road.
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Old 02-23-2012, 03:51 PM   #22
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The only thing I can think of why they do not recommend the use of synthetic oils is maybe they do not burn very well and will plug up your ports over time. As a mechanic of almost 40 years I have learned that the manufacturer recommendations as far as oil goes is probably best for the equipment. After all they were the people who spent millions doing all the R & D that goes into engine building. Nobody knows more about rotary engines than Mazda, that you can go to the bank on.
u also forgot that the end users (us) are the ones who actually find way more "bugs" of the car than any OE does ... Ask Hyundai what we 2011 Hybrid owners did to help them ...

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Yay and another synthetic oil debate with a **** ton of misinformation.
FREEDOM OF SPEECH!

YEah I know we had like 23490812049712 of Synthetic oil thread so ... another one doesn't hurt, right ?
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Old 02-23-2012, 06:01 PM   #23
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5w20 or 0w20 is in fact trash.

It exist simply because it would allow the engine to last until the manufacture warranty is over while giving a few extra % increase in mpg. And this applies to all kind of ICE, not just rotary.

Mazda is not stupid of course, but their marketing department is. We have such retarded mpg requirements that every one has to meet. And average americans sell their car when the manufacture warranty is over. So why is it sooo suprising that mnao pick an oil that would allow them to last long enough till the warranty is over?

Not to memtion if u want to argue 5w20 is good enough then you should explain why people that use 5w20 only is seeing abnormal stationary and rotor bearing wear?

Engine is just like everything else in life, some dies sooner rather than later. This engine seems to suck becuase every sigle people on earth is crying babies and whine about every single thing
Hahahaha, true. Lots of drama on any car forum!

I still feel the whole idea of Mazda recommending 5w-20 so that the engine will die soon after warranty expires is just a conspiracy theory, lol

Abnormal bearing wear is an interesting variable though.
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Old 02-23-2012, 06:07 PM   #24
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Couple of things can result those wear, oil is just part of the puzzle. But lets not get into that here. Rofl
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Old 02-23-2012, 06:08 PM   #25
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I'm not really sure why they were put together either. Makes me wonder....



I agree with all your statements, except the last one.

-Why is 5w20 only recommended in the USA?
-Do we have specially built engines compared to the rest of the world?
-Do we have a special climate that covers our entire country that no other part of the world sees, that would merit such a statement that only North American owners should use 5w20?

The short answer: US EPA
Totally agree with you.
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Old 02-23-2012, 06:08 PM
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