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#4479247 - 08/04/17 07:11 PM 1985 Mazda Rx-7 gsl-se
Clubber_Lang Offline


Registered: 09/01/10
Posts: 373
Loc: SC
I have an interesting engine and am seeking an oil recommendation.

Its a 13b Rotary Engine, stock in a 1985 Mazda Rx-7 gsl-se I recently acquired. It has 68,000 original miles and is (to my knowledge) used to a steady diet of conventional 10w-30. The car runs great, doesn't smoke and has no leaks.

Opinions on Oil are welcome.
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#4479269 - 08/04/17 07:36 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
A_Harman Offline


Registered: 10/01/10
Posts: 6915
Loc: Michigan
That's a pretty rare find. 13B's were only installed in the GSL-SE, and finding one with such low miles that hasn't been mechanically molested is great. Since that engine was built in the era of 1200+ Phosphorous levels, I think something like Valvoline VR1 10w30 conventional would be good. Apex seals are always the worry in Wankel durability, and zddp is for sliding wear resistance.
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#4479274 - 08/04/17 07:38 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
Mazda has (to the best of my knowledge) always recommended that rotary engines use conventional oil to prevent deposit formation in the engine ports. Not sure if this is warranted or not but lots of these lived their lives on conventional oil no reason that you couldn't continue running a conventional 10w30. I like Valvoline but that's a personal preference.
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#4479279 - 08/04/17 07:47 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18150
Loc: Dallas,Tx USA
Pictures please! slobber
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1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



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#4479285 - 08/04/17 07:51 PM Re: 1985 Mazda Rx-7 gsl-se [Re: aquariuscsm]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
Locally I saw an 88 with a V8 conversion for sale that I thought looked interesting.







https://cleveland.craigslist.org/cto/d/1988-mazda-rx7-8/6193725084.html

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#4479324 - 08/04/17 08:29 PM Re: 1985 Mazda Rx-7 gsl-se [Re: aquariuscsm]
Clubber_Lang Offline


Registered: 09/01/10
Posts: 373
Loc: SC


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#4479337 - 08/04/17 08:37 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
Clubber_Lang Offline


Registered: 09/01/10
Posts: 373
Loc: SC
The car certainly is not perfect. But it runs great and is in very clean "driver" condition.
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#4479359 - 08/04/17 09:03 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 466
Loc: Texas (south)
10w30 PUP
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#4479366 - 08/04/17 09:10 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1654
Loc: Crawfordville FL
My brother had one of those for a time. The secondaries would stick open and make life very interesting
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2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4479375 - 08/04/17 09:22 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
merconvvv Offline


Registered: 07/10/16
Posts: 682
Loc: il usa
Nice car.

When u crank it make sure it starts. Otherwise u flood the engine.
It will be a miracle if it starts on the second crank attempt.
Nothing serious just have to pay a little attention while firing up.

Give pp 10w30 a try.

Heard a lot of rx7 owners also like castrol gtx.
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1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
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#4479376 - 08/04/17 09:22 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
You do not run synthetic in these engines. Well you can, but you wont like the results. Mazda does not want you to run synthetics in these engines. Plus the engine is 32 years old and has likely run conventional oil its entire life....

I'd run a stout non-synthetic 10W30 diesel oil. Rotella T or similar. Conventional VR1 would also be a good choice.
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17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
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10 Acura TSX 2.4 PZL Plat 5W30
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#4479427 - 08/04/17 10:30 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
BrocLuno Offline


Registered: 09/06/15
Posts: 5506
Loc: Kalifornia Kollective
I know nothing of these engines. Always thought they were interesting, but never owned one ... OK, you know about my ignorance here, but what about a Grp III syn-blend like Maxlife? Wasn't around when this was new. So maybe it's OK - or not ...
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#4479434 - 08/04/17 10:44 PM Re: 1985 Mazda Rx-7 gsl-se [Re: bubbatime]
rooflessVW Offline


Registered: 12/24/11
Posts: 4022
Loc: North Carolina
Originally Posted By: bubbatime
I'd run a stout non-synthetic 10W30 diesel oil. Rotella T or similar.

Me too.
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#4479444 - 08/04/17 11:16 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18150
Loc: Dallas,Tx USA
Originally Posted By: Clubber_Lang





Good lord that's BEAUTIFUL!!
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



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#4479445 - 08/04/17 11:17 PM Re: 1985 Mazda Rx-7 gsl-se [Re: Clubber_Lang]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18150
Loc: Dallas,Tx USA
I'd go with pyb or qs 10W30.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



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