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#4698654 - 03/18/18 01:08 PM Magnatec 10w40 after 9500 kms
Matt97 Offline


Registered: 03/22/16
Posts: 58
Loc: South Africa
Changed the oil today on my Mazda 323 ,B3 engine,after running 9500 kms on Magnatec .Oil was pitch black and dead thin.Expected more from a premium oil in a simple engine ? Only 8 months since the last change.Was hoping to do 15000kms on that fill however the lifter noise made me change earlier .

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#4698691 - 03/18/18 02:09 PM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
danez_yoda Offline


Registered: 07/18/09
Posts: 407
Loc: texas
Was this the first time using magnetec. What was used before? It could be magnetec was cleaning old sludge and possibly got some fuel dilutin that made it thin.


With any new oil change, give it a few changes and see if it gets better.

My wifes new to us 07 sienna with 25k miles did the same to us with penzoil platinum. First change wasblack and thin as [censored]. New two got better buy the fourth one, it was still pancake syrup brown/clear after 5k and then s i started pushing it to 8k. Nowadays i stick with 5k since oil is so cheap and oc are easy for me.


Edited by danez_yoda (03/18/18 02:10 PM)

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#4698709 - 03/18/18 02:32 PM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 424
Loc: Texas (south)
All oils thin out in my engine when they get near the recommended OCI mileage. Maybe it is something peculiar and particular to your engine. Don't rule that out.
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#4698755 - 03/18/18 03:24 PM Re: Magnatec 10w40 after 9500 kms [Re: danez_yoda]
Matt97 Offline


Registered: 03/22/16
Posts: 58
Loc: South Africa
It was the first time on Magnatec .Car has done 255000kms on Shell/Total 20w50 oils .Fuel dilution is a point as its only driven (many) short distances

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#4699007 - 03/18/18 07:34 PM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 7472
Loc: Cincinnati, OH, USA
Black & thin generally means fuel dilution. Anybody in SA do UOAs? If it never gets cold there, 20W50 could handle more fuel without getting thin, it was an old standby in my younger days of leaky carburetors (Castrol GTX).


Edited by bullwinkle (03/18/18 07:35 PM)
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#4699114 - 03/18/18 08:49 PM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
Linctex Offline


Registered: 12/31/16
Posts: 5694
Loc: Waco, TX
Originally Posted By: Matt97
Oil was pitch black and dead thin.


It will probably seem pretty thin compared to the 20W-50 you are used to.

You would need fuel dilution and also viscosity tests from an oil lab to tell you "more than what meets the eye"
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#4699159 - 03/18/18 09:33 PM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 916
Loc: Oregon
Hard to blame the oil without a UOA.
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#4700374 - 03/20/18 06:20 AM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
Matt97 Offline


Registered: 03/22/16
Posts: 58
Loc: South Africa
Oil analysis is generally only done by suppliers for big fleets,price for a one off test is prohibitive. Tend to agree with fuel dilution as its a carb engine running many stop starts.

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#4700376 - 03/20/18 06:22 AM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
Matt97 Offline


Registered: 03/22/16
Posts: 58
Loc: South Africa
The service manual calls for a 20w50 oil changed at 10000km intervals. Old engine design, first in use in the late eighties

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#4700389 - 03/20/18 06:52 AM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
4WD Offline


Registered: 09/21/10
Posts: 6002
Loc: Texas/International
We just changed Magnatec 5w20 that was extremely black and thick at only 4K miles. Engine has but 45K.
Same oil before and after but bought some QSUD and will give it a bit of chemical change after this ...
Odd part in seeing it so thick was a fuel smell 3.6L Pentastar generally pretty mild on oil - but this car is very much a short tripper
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#4700414 - 03/20/18 07:42 AM Re: Magnatec 10w40 after 9500 kms [Re: Matt97]
KCJeep Offline


Registered: 06/30/11
Posts: 6971
Loc: Mahzurrah!
Depends on the engine and use I guess. I have Magnatec in my Lincoln right now, second OCI of it. It's at over 8k miles and is dark honey colored and nothing seems odd about the consistency. But that vehicle is driven a lot, with a lot of highway commute miles, and the engine is clean.

That's the full syn 5w30 though so not exactly the same oil as the OP's either.
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