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horrible mpg, and frothy oil

Discussion in '2nd Gen. Tacomas (2005-2015)' started by DSMissed, Feb 22, 2010.

  1. Feb 22, 2010 at 6:05 PM
    #1
    DSMissed

    DSMissed [OP] Well-Known Member

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    Not sure if the 2 are related, but anways, I could use some help.

    I just bought the truck a month ago, and I wasn't sure about when the oil needed changed, but the light came on yesterday, so I changed it today and put in Mobil synthetic 10w30.
    Anywho... when I drained the oil, there was alot of frothy bubbles on the drain plug. I went ahead and added new oil, and after I got 5 quarts in, I fired it up for about 5 minutes just to see where the level was at so I didn't overfill. After shutting it off, I pulled the dipstick out and there were those frothy bubbles again.

    I may just be anal, but in my car, frothy bubbles is a blown headgasket. I doubt I have a problem that serious, but just curious what you all think.

    As for mpg... I used over 1/4 of a tank today going less than 70 miles... most of which was interstate at 60-70mph. I'm no mathematician but that equals out to LESS than 280 miles to a tank... which is like 13 mpg. I do have a cold air intake, but I drive as much under 2000 rpms as I can, and I still do terrible.

    Thoughts???
     
  2. Feb 22, 2010 at 6:15 PM
    #2
    DeeKay21

    DeeKay21 Lieutenant Dan.

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    What year Tacoma did you get? I have a 2006 and I'm pretty sure all 2nd generations take 5W 30 instead of 10W 30. I know that has nothing to do with the bubbles but just some info for you.;) I also get pretty poor gas mileage but that was after my 3" lift and 33"s. I also have a TRD CAI and a Flowmaster cat-back exhaust system.
     
  3. Feb 22, 2010 at 6:16 PM
    #3
    Tsenekos

    Tsenekos Well-Known Member

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    not too sure about the frothy bubbles but keep an eye on it and the gas mileage youre getting is about the same as mine since bigger tires and lift + winter gas
     
  4. Feb 22, 2010 at 6:20 PM
    #4
    Zizo

    Zizo Engineer Extraordinaire

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    As far as "frothy bubbles", when you took the oil cap off, was there a beige looking residue on the cap? This type of frothy bubbles just means there is slight moisture in the oil. This is a very common occurrence in colder areas. Nothing to be worried about. Although the weird thing is that you would not have this froth on the drain plug. If it is there, then all the oil should be frothy. The only place you would see this is on the cap and maybe on the dipstick.

    And for future reference, even though synthetics hold to their viscosities better than conventional oil, it is best to use a thinner oil like 5W30 in the winter. The colder it gets, the thicker the oil will be to pump at startup and when cold.
     
  5. Feb 22, 2010 at 6:21 PM
    #5
    hendooman

    hendooman The Stroker Ace

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    There has been a lot of frothy oil threads lately. Concensus has been that it is due to a lot of short trips, and the cold. I would suspect that the winter gas is not helping your mpg's either. My gas mileage stinks as well, I can't get over 17.
     
  6. Feb 22, 2010 at 6:24 PM
    #6
    Brunes

    Brunes abides.

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    There have been a lot of creamy oil at the filler neck threads- If you are getting froth in the bottom end you need to get that shit looked at or at least get the oil analyzed.

    Is this terrible MPG recent or it's been happening since you bought the truck??
     
  7. Feb 22, 2010 at 6:33 PM
    #7
    DSMissed

    DSMissed [OP] Well-Known Member

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    Geez, I can't believe myself sometimes. The cap says right on it 5w30, and what do I do... get the wrong stuff.
    Well I guess at least I'm not the only one with frothy oil, so I'll stop worrying about it then. I did try and search 'frothy' and 'bubbles' and didn't come up with any threads, so I figured I was one of few with the problem.
    The mpg thing really bugs me. I'm getting the mileage of a v8 with a v6, and I baby the throttle. I don't have a lift, or bigger tires... I hope it gets better.
     
  8. Feb 22, 2010 at 6:36 PM
    #8
    DSMissed

    DSMissed [OP] Well-Known Member

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    The oil plug had bigger bubbles on it, not quite froth. What would that mean???

    When I bought the truck I had to drive it home from Vegas, and I averaged 16mpg. Its weird to say, but it seems my mileage is getting worse by the day. I just can't really pinpoint the issue? I did buy a stock intake from a kid on here... I'm going to throw that on and see what happens as soon as I get it in the mail.
     
  9. Feb 22, 2010 at 10:08 PM
    #9
    eight3one_offroad

    eight3one_offroad Honey your two French Fries short of a Happy Meal.

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    I would switch back to 5W30, thicker oil usually makes the engine run harder and using up more gas. You'll be good again :)

    - Rich
     
  10. Feb 22, 2010 at 11:16 PM
    #10
    ryhar85

    ryhar85 Well-Known Member

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    I have religiously changed my oil every 5k, and never had any type of bubbles/froth. But this last time I slacked off and waited till like 8k and sure enough there was froth when I drained it. The old oil just had more time to break down and add more contaminants over time. I have always run full synthetic.

    So chances are, since it sounds like you bought it pre-owned, it had prob been a while since the oil was changed. And as far as the mpg goes, the main mpg robber for me is always a dirty air filter. I will notice a 2mpg gain consistently after I change the filter out. Did you clean/ replace it when you did the oil change?

    I don't think 10w30 instead of 5w30 would have too much affect on mpg, but you never know. If you are concerned about, I would just switch it back.
     
  11. Feb 22, 2010 at 11:24 PM
    #11
    ryhar85

    ryhar85 Well-Known Member

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    Also, the only way to accurately measure mpgs is to top off your tank, set the trip meter, then when you fill up again, divide the miles you drove by the gallons it takes to top it off again. You can never really trust the gas gauge to tell you exactly how many gallons are in the tank. :)
     
  12. Feb 23, 2010 at 5:16 AM
    #12
    blazze2005

    blazze2005 Well-Known Member

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    Use 5W-30

    Clean the throttle body

    Clean the Mass Air Flow sensor with the special CRC MAF cleaner

    Change you plugs

    After doing this you should see your MPG's go up
     
  13. Feb 23, 2010 at 5:35 AM
    #13
    wiscdave

    wiscdave Lets Do It!

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    Lose the CAI, all it does is suck gas and lose low end torque.
     
  14. Feb 23, 2010 at 6:21 AM
    #14
    ShadowFalken

    ShadowFalken Well-Known Member

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    Some good quality pictures of what you are seeing would be helpful.

    Use the right oil. Oil viscosity will have a mileage impact.

    Air filter MPG increase on a modern, fuel injected engine is a myth. Proved in the lab. The fact that this type of marketing is still out there and used to sell filters when it is not scientifically sound really grinds my gears.
     
  15. Feb 23, 2010 at 10:03 AM
    #15
    DSMissed

    DSMissed [OP] Well-Known Member

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    The intake was on the truck when I bought it, I bought a stock intake last week from a guy on here, I hope he sent it...

    I'll clean out the tb and sensor this weekend. I'll search the best plugs to use, and throw a new set in, see what happens.

    I'm really mad I spend $50 on the wrong oil. I'll probably wait a couple weeks to change that, get a little use out of it anyways.
     
  16. Feb 26, 2010 at 6:08 PM
    #16
    DSMissed

    DSMissed [OP] Well-Known Member

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    So I found out my mpg problem.

    Basically I let the fuel gauge hit empty for the first time. It was about a tick away from the red mark when I filled it... it took 15.7 gallons and was on full. So where the hell is that other 5 gallons going? I'm gonna be TICKED if the fuel gauge reads that inaccurately.

    Maybe my cheapo rear leaf springs are sagged so badly all the fuel is at the back of the tank... that would just be awesome.
     
  17. Feb 26, 2010 at 6:16 PM
    #17
    tinker_troy

    tinker_troy Wo die weißen Frauen an?

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    That is weird! Wish I had an idea but I don't.
    Mine is about down to 1/4 right now, I will let it get down to the red just to see how many gallons it takes cause now I am curious.

    Oh and as far as plugs go I think if you search on here everyone pretty much recommends going to the dealership and getting the stock Denso plugs.
     
  18. Feb 26, 2010 at 6:35 PM
    #18
    DSMissed

    DSMissed [OP] Well-Known Member

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    Yeah, I'm curious if other people have the same issue. I did see a few threads about the fuel gauge reading fairly inaccurately due to the shape of the gas tank... but what I'm experiencing is a little too outrageous. I mean I can seriously watch the gauge going down as I drive in grandpa mode... at least I do know that my mpg isn't as bad as I thought it was, but a fuel gauge being this inaccurate is something I'd expect on an old truck, not a new one.
     
  19. Feb 27, 2010 at 11:44 AM
    #19
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    I think when the low fuel light comes on, you have about 4 more gallons of fuel left.
     
  20. Feb 27, 2010 at 1:16 PM
    #20
    DSMissed

    DSMissed [OP] Well-Known Member

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    Just for reference I calculated my true mpg today, and its just a hair over 15 driving normally in town.
     
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