Fuel dilution - Page 2
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Thread: Fuel dilution

  1. #11
    OptimaForums Veteran carguy75's Avatar
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    Quote Originally Posted by KingFatty View Post
    I don't remember, but doesn't it say either is fine? I sure don't recall feeling like I should get the thicker oil. "Thicker is better" - that's what she said, not what the manual said...?
    Good one!!!

    The owner manual do not state that 5w-40 is better than 5w-30 in those exact words.

    The manual just says that thicker oils protect the engine better in warmer regions and the thinner oils give better fuel economy.

    It states that you should use the appropriate approved oil weight (viscosity)for your region.

    So if an oil weight protects an engine better in warmer climates, that means that the oil weight does a better job of protecting the engine overall.

    I know some will say that the lighter weight oil is better for colder regions, well KIA specifies 5W weight as the lightest weight to use so both the 5w-30 and 5w-40 will perform about the same in cold climates.

    Unless you live somewhere that gets down to -50C then you will not really tell a different in start-up flow between the two oils in extreme cold.

    However, i know that you could interpret the information differently.

    Just check your manual section about oil and read the entire section.
    Last edited by carguy75; 01-08-2017 at 10:23 PM. Reason: info
    2014 Black KIA Optima SXL loaded w/

    AEM dry performance drop-in air filter w/radiator cowl panel removed
    Hella yellow HID look H7 high beam light bulbs
    Running only Shell V-power 93 octane gas
    5w-40 Total Quartz 9000 Energy synthetic oil
    NGK ILKR8E6 spark plugs(1422)
    Bosch Icon wiper blades- 24A, 18A
    Black check-mark fog light trim
    Michelin Primacy MXM4 225/45-18 tires
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  3. #12
    Shuttle Driver
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    Take it from someone who saw 5%+ fuel dilution in his 2.0 Optima - at that rate you WILL smell fuel in the oil.
    Being you have two different readings but of the same digits, I'm guessing someone missed a decimal.

  4. #13
    OptimaForums Veteran carguy75's Avatar
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    ^^^^Make sense.
    2014 Black KIA Optima SXL loaded w/

    AEM dry performance drop-in air filter w/radiator cowl panel removed
    Hella yellow HID look H7 high beam light bulbs
    Running only Shell V-power 93 octane gas
    5w-40 Total Quartz 9000 Energy synthetic oil
    NGK ILKR8E6 spark plugs(1422)
    Bosch Icon wiper blades- 24A, 18A
    Black check-mark fog light trim
    Michelin Primacy MXM4 225/45-18 tires
    Hawk HPS 5.0 Front brake pads HB661B.667
    Centric Posi Quiet Ceramic Rear brake pads 105.15440

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  6. #14
    Riding Lawn Mower
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    It makes a lot of sense that is why I am reaching out to them for answer. Their comments reflected a .5% not a 5%. In oil analysis a decimal can make a huge difference.

  7. #15
    Riding Lawn Mower
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    After contacting both companies I have the answers I needed. There wasn't any misplaced decimal. Both companies do different tests for fuel %. One company does a flash point of the oil then takes the results and uses it as an estimate of fuel dilution. The company did a retest of my oil and it showed now a 1.5% fuel dilution based on the flash point, the previous test showed .5%. The other company uses a gas chromatography which test for fuel chains in the oil. A much more accurate test for fuel %. this is the company that showed a > 5% fuel dilution.
    So, based on very small information testing companies have for GDI engines because they are fairly new to the industry. No one knows what is a normal fuel % that is acceptable. Since my test showed some oil viscosity loss due to the fuel and possibly shearing, the wear results are favorable. Probably because I was using a quality oil (amsoil). I did choose to go with a 5w-40 oil which should handle any dilution during the 5k miles and keep the viscosity in good range. The key is also to have a good synthetic oil that can handle the effects of fuel and keep protecting the engine.
    I hope this information helps you guys.

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  9. #16
    OptimaForums Veteran carguy75's Avatar
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    Sound good to me.

    Well, not the 1.5% fuel dilution since the results came back even worst than before from .5% to 1.5%.

    Anyway, good information.

    The VW/Audi guys have been dealing with direct injection issues every since 2006.

    This is an old topic for me since i have owned a VW direct injected turbo a while ago(2006 GLI), but very new to many owners on this forum.

    Hopefully this information will help someone squeeze a bit more life out of their engine if they follow your advice.
    2014 Black KIA Optima SXL loaded w/

    AEM dry performance drop-in air filter w/radiator cowl panel removed
    Hella yellow HID look H7 high beam light bulbs
    Running only Shell V-power 93 octane gas
    5w-40 Total Quartz 9000 Energy synthetic oil
    NGK ILKR8E6 spark plugs(1422)
    Bosch Icon wiper blades- 24A, 18A
    Black check-mark fog light trim
    Michelin Primacy MXM4 225/45-18 tires
    Hawk HPS 5.0 Front brake pads HB661B.667
    Centric Posi Quiet Ceramic Rear brake pads 105.15440

  10. #17
    OptimaForums Veteran KingFatty's Avatar
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    Yes sir, convert here, will be switching from 5W-30 to 5W-40 next oil change.

  11. #18
    Riding Lawn Mower
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    Here's the 2 oil analysis. This way you can see the actual results instead of just reading it. Hope this will help you out.
    Fuel dilution-blackstone.jpg
    Fuel dilution-oilanalyzers.jpg

  12. #19
    OptimaForums Veteran carguy75's Avatar
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    One test claims everything is doing well, even if the results show reduced oil viscosity and fuel dilution(Black Stone as usual).

    One test express concern about the reduced oil viscosity and fuel dilution;plus they recommend a shorter oil change interval to see if the oil results improve(Oil Analyzers).

    I personally prefer Oil Analyzers cautious method of reporting much better than Black Stone very optimistic reports that seem to always just shrug away low viscosity numbers on most reports posted on this forum, and even recommend extending oil change intervals on oil that test below the recommended viscosity.

    I will still send a sample to Black Stone since I do have the kit already, but I will try both companies the next time.
    2014 Black KIA Optima SXL loaded w/

    AEM dry performance drop-in air filter w/radiator cowl panel removed
    Hella yellow HID look H7 high beam light bulbs
    Running only Shell V-power 93 octane gas
    5w-40 Total Quartz 9000 Energy synthetic oil
    NGK ILKR8E6 spark plugs(1422)
    Bosch Icon wiper blades- 24A, 18A
    Black check-mark fog light trim
    Michelin Primacy MXM4 225/45-18 tires
    Hawk HPS 5.0 Front brake pads HB661B.667
    Centric Posi Quiet Ceramic Rear brake pads 105.15440

  13. #20
    Riding Lawn Mower
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    carguy75, very good synopsis of both analysis! There should be concern with a report showing viscosity loss of a very good oil only after 5k miles. The oil was already heading into 20 weight parameter. I could only imagine if I were to extend it to 10k, which I wouldn't. I will take the advice of Oil Analyzers and re-sample at 2.5k and see how my 5w-40 is handling the dilution. (Which is Total Quartz 9000 Energy)
    I look forward to seeing your reports. keep me posted
    Last edited by Runner3264; 01-12-2017 at 10:58 PM.

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