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#4513612 - 09/11/17 07:41 PM 1987 Mazda RX-7, 120K, Super Tech 20w50
nathan298 Offline


Registered: 11/09/14
Posts: 11
Loc: Bristol, VA
All original, 120,000 miles, non-turbo, 20w50 Super Tech conventional, standard STP filter. 500 miles and 1 year on this oil.

https://photos.app.goo.gl/7fn7AZ3PmpVgfPH73
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#4513617 - 09/11/17 07:49 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18182
Loc: Dallas,Tx USA
Man that's a THIN 20W50!! I'd drop Supertech like a bad habit.
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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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#4513620 - 09/11/17 07:55 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
LotI Offline


Registered: 01/01/13
Posts: 1268
Loc: America's Dairyland
500 miles? I walk more than that in a year.

Sell the car
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#4513621 - 09/11/17 07:56 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: aquariuscsm]
nathan298 Offline


Registered: 11/09/14
Posts: 11
Loc: Bristol, VA
Yeah, I may go back to the yellow bottle Pennzoil.

There's no way I'll ever sell that car, my mother bought it new and drove it until 2000, then it sat 12 years until I got it running again. I hadn't driven it much lately because it has no heat, no A.C., no power steering, wouldn't idle, no front brakes, etc. I fixed all of those things in the past few weeks, so I plan on putting more miles on it now. Plus, I have 5 other vehicles, so that means less seat time in it.


Edited by nathan298 (09/11/17 07:59 PM)
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'11 Mazda 2 1.5L 5 spd
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#4513635 - 09/11/17 08:09 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
PimTac Offline


Registered: 03/04/17
Posts: 4338
Loc: Soviet State of Washington
Does the Supertech oil usually have that amount of sodium in it? Looks more like Valvoline.

OP, I might suggest blacking out your personal info on that analysis report.
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#4513636 - 09/11/17 08:12 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: aquariuscsm]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: aquariuscsm
Man that's a THIN 20W50!!


Ya it is ! Barely over 10W-30 !

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#4513650 - 09/11/17 08:27 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
stockrex Offline


Registered: 01/08/06
Posts: 2434
Loc: Michigan
Nooooooooooooooooooooooooo, don't sell it.

One of the hardest thing for a rx-7 is to idle, that sucker run richer than Adnan Khashoggi's blood alcohol.

Also, if you don't use it enough the injector stick, don't spray.

Well I changed my mind, sell it!
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#4513695 - 09/11/17 09:04 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
nathan298 Offline


Registered: 11/09/14
Posts: 11
Loc: Bristol, VA
That car is at best a $800 car, so if I were to sell it here in rural Appalachia one of two things would happen:
1) some hillbilly would run it into the ground and then crush it.
2) some hillbilly would swap a smallblock Chevy engine into it, run it into the ground, then crush it.

I think she's way better off in my climate controlled garage being religiously maintained and driven at least twice per month. grin
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'87 RX7 Sport
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#4513701 - 09/11/17 09:09 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
PimTac Offline


Registered: 03/04/17
Posts: 4338
Loc: Soviet State of Washington
If you were to sell it I would advertise outside your area or in a Mazda fan publication or website.

Are you sure that oil was Supertech 20w-50?
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#4513758 - 09/11/17 10:15 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: PimTac]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Looks like a low additive oil, which (If I am not mistaken) is kind of desired for rotaries.

Originally Posted By: PimTac
If you were to sell it I would advertise outside your area or in a Mazda fan publication or website.


Naturally, that would be the best audience.

Originally Posted By: PimTac
Are you sure that oil was Supertech 20w-50?


Kind of wondering the same thing.... that's just not normal.
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#4513780 - 09/11/17 11:16 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18182
Loc: Dallas,Tx USA
Sounds like that car is your baby smile Lots of sentimental attachment to it. Treat her good with the best fluids. Pennzoil and Quaker State conventional are among the best imo. A friend of mine had a 93 twin turbo RX7 and he ran Quaker State conventional in it.
_________________________
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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#4513781 - 09/11/17 11:18 PM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
Brons2 Offline


Registered: 09/16/03
Posts: 3042
Loc: Austin, Texas
Other than the viscosity being so thin I'm not really seeing a problem with this motor.
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#4513833 - 09/12/17 01:32 AM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: nathan298]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Surprised no one has mentioned you really can't use synthetics in these.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4514070 - 09/12/17 09:17 AM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: Linctex]
A_Harman Offline


Registered: 10/01/10
Posts: 6921
Loc: Michigan
Originally Posted By: Linctex
Surprised no one has mentioned you really can't use synthetics in these.


Idemitsu makes a synthetic specially designed for the Mazda rotary, but typical synthetics are not recommended.
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#4514083 - 09/12/17 09:28 AM Re: 1987 Mazda RX-7, 120K, Super Tech 20w50 [Re: aquariuscsm]
A_Harman Offline


Registered: 10/01/10
Posts: 6921
Loc: Michigan
Originally Posted By: aquariuscsm
Man that's a THIN 20W50!! I'd drop Supertech like a bad habit.


I agree, that's a weak-looking oil. It is down to a 40-weight, and a light one at that, with LOW ZDDP content. And the UOA is showing both fuel and antifreeze. I suggest running some kind of old-school conventionsl, like Valvoline VR1 20w50. Drive it more. Get the injectors cleaned and flow tested. And keep an eye on the fuel and antifreeze contents in future UOA's.
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1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
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