I always hear from other rotary people not to use Synthetic motor oil but they never tell me why. I juss wanna know!! WHY?!?!?! hehe. if someone could give me some more info on dat.

 

well i dont have the thread saved but...basically way back when mazda tested synthetics(early ones not todays ) there was one or 2 that failed.. so thay said to not use them @ all...everone has a opponion on this one...if you do a search you should get a billion hits, but syn burns at temps near reg dino oil...some people think it will build up more carbon, but theres no testing to prove that...and theres a abt 1/2 of this forum runs syn and love it...it just costs more but its better protection

 

The rotary engine injects oil to lubricate the apex seals and as a result, oil is part of the combustion process. Some synthetics did not burn cleanly and left deposits in the rotor chambers. This is why Mazda stated to use no synthetics. Currently, I'm using dino juice because I don't want to take any chances that my extended warranty company will not honor the repairs (since Mazda clearly states not to use it). Eventually, I will probably switch to synthetic, especially as the engine and turbos get older.

You also don't want to use synthetic to break in engine/trannies/diffs because it will take too long to break them in.

 

Spoken to a UK specialist that race RX7's and they use a synthetic called Shell Helix. Or something like that. Anyway he said any other synthetic was produced with a different chemical (or something to do with the manufacturing process) which when burned caused a glass like residue (spelling) to form inside the chamber, which is a bad thing .

Chun.

 

You can use synthetic if you want in your FD. The most important thing to do is change your oil every 1500-2000 miles. I don't use synthetic oil and get an oil and filter change every 1300 to 1500 miles. Also, make sure to check the oil every 500 miles, because the FD likes to use a lot of oil.

 

I dont see any problems from using synthetic oils in a rotary but is it really worth it?If you change youre dino oil every 2K or less you are insuring that youre motor only gets fresh oil which is the best thing you can do for youre engine.The added cost of synthetic oil doesnt make sense unless you are extending youre oil changes and I wouldnt in a FD.

 

I hear nothing but good things from those who use synthetic. I also hear when the engine gets rebuilt the synthetic lubricated engines are much cleaner and the parts are less worn.

 

Eggcellent "Type RZ does thingy with fingers" i will use synthetic!! but only the good ****! haha how much does a quart of redline cost anyways?? isnt it like 4 or 5 a quart?? actually thinking about it how about if i juss put in castrol synthetic would you recomend doing that?? or should i try using the more expensive synthetic??

 

Synthetics might show less wear on engine parts when its rebuild time.But in the FD it dosent make a differance, problem with these cars is not all wear and tear from high milage and type of oil used.You have a better chance of having to rebuild because of o-ring failer,over heating,running lean,apex seal failer,detonation, synthetic oil is not going to prevent this and when it comes to rebuild time who cares what oil you used.Its just a waste of expensive oil with no real long term benifits?

 

partially true, but synthetics do help the engine and turbos operate cooler, especially under high rpm operation, and anything that can be done to lower engine and turbo operating temps decreases the liklihood of detonation and/or premature turbo wear

I use Mobil 1 20w-50 and the new Fram high effeciency ("X2") oil filters...I change my oil every 3,000 miles now and it still looks pretty good (used to change it every 1500 with dino)

 

There were a couple of long threads about this late last year (if still available to search). I think it comes down to the ash content of synthetics. From what I've read, Mobil 1 and Amsoil have very low ash and should be fine. The Mobil 1 web site addresses this issue and says extensive testing shows no issues. I know places like Racing Beat have used synthetic for years without problems.

 

Gordon,

You say Mazda now says it's OK to use synthetic in rotaries. That one slipped by me. Can you tell me where they made that statement? I'd appreciate any info you can give me. Thanks.

JC

 

If I'm going to change my current oil (Castrol GTX 10w30) with Mobil One Synthetic (rating suggestions for a Florida car), then do I need to flush the system first? If so, then should I flush it with flushing oil or just buy an extra amount of Mobil One? Also take into account that my car has 101K on it's original engine. Perhaps I should just stick with dino until the engine needs rebuilding?
Opinions? Experience(s)?

-Jon

 

You don't need to flush it. There is certainly no harm in mixing dino juice with synthetic, in fact most oil brands sell a mixed blend as a lower cost alternative to full synthetic.

 

Thanks you guys im definitly going to go with synthetic and probably just going to buy mobile 1 synthetic. once again thanks for everyones feed back!!!! and my car is gonna be out da shop this sunday!! with 2mm Ceramic seals, mild street port and dial pins!!! whooooo yahhhhh!!!

 

dowl pins?? you got extra dowl pins put in? What for unless you plan on runnin around 600+ hp??

 

So how often do we need to change eng. oil if we are using Mobil One Synthetic? 3K miles?

 

If you are gona go 3K between oil changes, at least change the filter at 1.5K and use a very high quality filter in the taller size (not the short stock size).

Of course it's better to put fresh oil in at 1.5K along with the filter. Overkill is good.

 

Dial? Dowl? Dowel pins! That's better.

-Max

 

I have been running Castrol Syntec 5w-50, and I remember the first drive I took with the synthetic. first, when the car was warming I walked behind it to pick some stuff up, and notice how smooth it's idel sounded. then when I drove it, the car just felt liek it ran better. I use a Purolator pure one oil filter cuz it has that anti drain-back vavle in the MX-6 size. As I see it, it comes down to how much you want to spend. I really care about my FD, so I don't mind spending some extra $$ to give it a longer life. I am probably gonna switch to mobil 1 soon myself though to try it out.

 

There is nothing wrong with synthetic... Many companies use it, like Pettit for one. can't think of anymore

1FAST7

 

Anyone know how much a quart of Royal purple is? I was at nappa today but forgot to look

 

I have had no problems using redline oil for 50k so far...

 

 

Sure why not.