Nasty engine oil - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 10 (permalink) Old 12-25-2017, 12:20 PM Thread Starter
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Nasty engine oil

I bought my 2008 Mazda 3 (2.3L) from a <gasp> Used Car Dealer, and after fixing a couple bugs, I dearly love the car. But at 1500 miles, the oil started looking a little dark for my taste. I made them change it before I paid for the car, so I know it was clean. Still looked great after 100 miles.

My question is: Is this common, or should I be looking at something? Should I try taking off the oil pan and flushing the engine with solvent, and let it drain really good and dry for a couple of days before closing it up and putting in new oil and filter? Or is it just like a PCV or EGR valve? Any experience would be helpful.

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post #2 of 10 (permalink) Old 12-25-2017, 12:32 PM
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Under most conditions, oil will begin looking dirty pretty quickly, so I wouldn't worry too much about it. Choose a good oil and filter and change it at recommended intervals, and you should be good to go.

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post #3 of 10 (permalink) Old 12-25-2017, 12:39 PM Thread Starter
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Quote:
Originally Posted by GerryBuc View Post
Under most conditions, oil will begin looking dirty pretty quickly, so I wouldn't worry too much about it. Choose a good oil and filter and change it at recommended intervals, and you should be good to go.

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On vehicles I have had in the past, I have been known to use the above listed procedure, and have had greatly improved appearance of the oil, for anywhere from 4-5000 miles, including in an old Ford pickup with a 390 ci engine. I guess I will just keep an eye on it for now. I always try to change every 3000 miles anyway.
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post #4 of 10 (permalink) Old 12-25-2017, 03:20 PM
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There's a chance there may have been some nasty left in the engine after they changed it, too. Oil is cheap. If you feel uneasy about it, change it so you have your own baseline.

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post #5 of 10 (permalink) Old 12-25-2017, 04:58 PM
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a good quality oil will have special detergents in them which clean your engine
cheap oil will not and will leave all that gunk inside your engine
if the oil turns black repeatedly under 3,000miles then that is not a good sign
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post #6 of 10 (permalink) Old 12-25-2017, 05:34 PM
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One thing to keep in mind, the additive package in different oils react differently to engine heat; some oils naturally darken, some to not. Case in point, if you look over on the BobIsTheOilGuy.com web site, you'll find many (like hundreds) of UOA reports for various grades of Mobil 1; Mobil's additive package is well known to naturally darken to the point of being black in just a thousand miles or two. Even when Mobil 1 is completely black and you cannot see any light through a jar of the used oil, it is still extremely capable of providing protection for your engine.

Long story short, the color of the oil in you engine has absolute zero correlation to the condition of said oil; some oils are completely exhausted and still look amber, some oils are completely black and still provide superior protection.

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post #7 of 10 (permalink) Old 12-25-2017, 09:53 PM
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If a used car dealer changed the oil, they used the cheapest, worst, shittiest shit oil they could find, along with a trash oil filter.

Get that crap out of there, start using Mahle, Mann, or Wix XP oil filters along with either Amsoil, Pennzoil Platinum, or Mobil 1 gold cap 5W-20 synthetic oil. Fact is, even with the good oil and filter, I'd do a few short cycle oil changes of about 1000 to 1500 miles to flush that old garbage out of the system.
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post #8 of 10 (permalink) Old 12-26-2017, 01:10 PM Thread Starter
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Quote:
Originally Posted by GerryBuc View Post
There's a chance there may have been some nasty left in the engine after they changed it, too. Oil is cheap. If you feel uneasy about it, change it so you have your own baseline.

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That is kind of what I was thinking.
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post #9 of 10 (permalink) Old 12-30-2017, 11:00 AM
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Add some Seafoam or Marvel Mystery with the next few oil changes. Part of the problem could be previous owners neglected proper oil change intervals which led to carbon build up in the crankcase and cylinders.

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post #10 of 10 (permalink) Old 03-15-2018, 12:57 PM Thread Starter
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UPDATE:

Upon closer investigation, I traced the car back before I got it, and got the following:

As I already knew, the transaxle had been replaced, though not properly, and that was corrected before I started driving the car.
As it also turned out, the engine had been replaced with a new one, apparently out of the box, and then the car was sold at auction. The really nasty oil I encountered when I bought the car, was break-in oil, most likely. Secondly, the oil I found after 1500 miles was like that because there was still gunk from the break-in in there somewhere. They changed the oil quickly.

Latest oil change reveals nearly invisible oil after 2000 miles, which is basically what I was looking for.

I got SUCH a good deal on this car!
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