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#2756816 - 09/28/12 02:39 AM PYB, 10W-30, 5,510mi. 1994 Mazda Miata
JGmazda Offline


Registered: 05/25/05
Posts: 463
Loc: Arizona


It's been awhile since I've had a UOA done. This is my first time going back to a conventional oil (PYB). I have been running QSUD before.

I'm a bit concerned about the copper... TBN looks good for PYB.

Any thoughts?

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#2756829 - 09/28/12 03:49 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
DemoFly Offline


Registered: 06/03/12
Posts: 817
Loc: Bremerton, WA
How many miles are on your Miata?
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#2756878 - 09/28/12 06:55 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
dnewton3 Offline



Registered: 05/14/07
Posts: 6367
Loc: Indianapolis, IN
I would not increase the OCI just yet. Stick to a 5k mile OCI for the sake of consistiency.

Monitor is the correct term here. Not time to panic. May be just a temporary.
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Conventionals vs. Synthetics isn't about which is "better"; it's about which lasts longer, while assuring safe operation, in relation to cost. Any product can be over or under utilized. The same applies to filters.
Make an informed decision; first consider your operating conditions, next determine your maintenance plan, and then pick your lube and filter. Don't do it the other way around ...

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#2756879 - 09/28/12 06:55 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
95busa Offline


Registered: 10/15/05
Posts: 1249
Loc: Tennessee
Looks like 180k
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#2756931 - 09/28/12 08:24 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
bourne Online   content


Registered: 12/20/06
Posts: 1387
Loc: Greenwood, IN
Does the engine spec 10w30 ? Does it allow for 5W30 ?? You might try 5w30 it it allows for it and see if it brings that wear down for you.
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#2756932 - 09/28/12 08:24 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
bourne Online   content


Registered: 12/20/06
Posts: 1387
Loc: Greenwood, IN
in other news , holy moly , calcium and zinc !!!!!!!
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#2756934 - 09/28/12 08:26 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
Boss302fan Offline


Registered: 11/07/09
Posts: 2203
Loc: Oconomowoc Wi
That's a lot of high revving miles on that engine. PYB is a good oil for you and I would stay with a 5K OCI...
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#2756939 - 09/28/12 08:32 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
Ram01 Offline


Registered: 10/13/10
Posts: 908
Loc: New York Queens
Wow TBN is still pretty high for a DIno pub gets my vote

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#2756964 - 09/28/12 08:58 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
Char Baby Offline


Registered: 05/25/05
Posts: 8606
Loc: Western NY
What was you previous oil?
Looks like there are some additives remaining from the other oil???

If PYB 10W30 looks this good, we should all be using it! smile
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#2757038 - 09/28/12 10:51 AM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
OMCWankel Offline


Registered: 09/16/04
Posts: 239
Loc: Florida
Hi JGmazda,
The report looks good. The only thing I saw was that the vis took a hit dropping to 9.5 cSt. I have two Miatas (Gen 1 and 2) that have more than 180K miles on them. My first Miata (now gone) went 300K with no internal engine work. I target a vis of around 11 cSt or better. Several of us Miata owners, including some on this board, are using Rotella T6 5W-40 with good results.
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#2757156 - 09/28/12 12:57 PM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
JGmazda Offline


Registered: 05/25/05
Posts: 463
Loc: Arizona
Hello Everyone!

I want to thank you all for your advice. My car does indeed have 180K miles. I thought I'd give the new PYB (SN) a run and see how it performed.

Yeah... It's interesting to see the high Moly, Calcium and Zinc.
I think the PYB is a very nice oil. It certainly seems to have the additives.

I have used many oils over the years. Everything from Mobil to Maxlife. There's such a wide-range of viscosity specs for this engine. 10w-30 is what I usually run here in Phoenix. I have used 5w-30 in the cooler parts of the year.

These engines rev like crazy on the highway. I am hoping my next UOA will show a reduction in the Copper levels. I've been advised that I shouldn't worry too much as the new "SN" cleaning pack might be the reason.

I guess we shall find out on the next UOA! I appreciate all the comments!

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#2757164 - 09/28/12 01:01 PM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: dnewton3]
JGmazda Offline


Registered: 05/25/05
Posts: 463
Loc: Arizona
Originally Posted By: dnewton3
I would not increase the OCI just yet. Stick to a 5k mile OCI for the sake of consistiency.

Monitor is the correct term here. Not time to panic. May be just a temporary.


Thanks! Yes, it may just be a small spike related to the test. I'll see what the next UOA brings.

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#2757173 - 09/28/12 01:08 PM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: OMCWankel]
JGmazda Offline


Registered: 05/25/05
Posts: 463
Loc: Arizona
Thanks for the advice. Yes, this has been the best little car! These engines seem to be built for a least 300K miles. I've heard about the Rotella T6. It's interesting to see a higher cSt oil being used.

Have you noticed an improvement by going with the T6?

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#2757358 - 09/28/12 03:27 PM Re: PYB, 10W-30, 5,510mi. 1994 Mazda Miata [Re: JGmazda]
OMCWankel Offline


Registered: 09/16/04
Posts: 239
Loc: Florida
I've tried 10W30 before (M1 10W-30 EP) and was not pleased with the results (seat of pants test, engine noise/smoothness). I then added some M1 15W-50 to the mix and it got better - I ran a UOA at that point (http://www.bobistheoilguy.com/forums/ubb...9978#Post949978).
The Rotella T6 is at least as good (SOP test) as that blend. I am going to run a UOA soon. A Miata UOA on Rotella T6:
http://www.bobistheoilguy.com/forums/ubb...rue#Post1639610
_________________________
1997 Miata M1 0W40
2004 Mini Cooper S M1 0W40
2014 Ford Fiesta 1.6L M1 0W30
2000 Moto Guzzi Jackal RT 15W40
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