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MPG improvement with switch to synthetic?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by eye one, May 8, 2008.

  1. May 8, 2008 at 6:43 PM
    #1
    eye one

    eye one [OP] Well-Known Member

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    I switched to Mobil 1 full synthetic in the engine, and vavoline synthetic gear oil in the rear diff (will do front and transfer soon). Either my driving habit changed drastically (not) or it's giving me a couple extra 2-3MPG. I didn't think much about it before the change, maybe my truck is just starting to break in at 13,000 miles which would account for it too.

    If this increase is due to synthetic then I can only imagine the additional longevity I will get from the reduced friction. Anyone else experience better gas milage with a switch? Is it my imagination and the scangauge is lying? :D
     
  2. May 8, 2008 at 6:48 PM
    #2
    gdawg25

    gdawg25 Zoom-Zoom

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    I switched to Mobil 1 after about 16,000km and didn't notice a change in mileage.
     
  3. May 8, 2008 at 6:49 PM
    #3
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    Will
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    getting there....
    you are right on....you'll get better results from switching to syn.,it causes less drag on engine parts, therefore, a little better performance and mileage.
     
  4. May 8, 2008 at 6:55 PM
    #4
    eye one

    eye one [OP] Well-Known Member

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    Maybe it's the rear diff contributing the most gain? That junk I drained out was nasty, I was surprised how ugly the oil looked after 13K miles. The magnetic drain plug was coated with oil that had the consistency and appearance of grey clay, the oil was black.
     
  5. May 8, 2008 at 6:58 PM
    #5
    gdawg25

    gdawg25 Zoom-Zoom

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    Was it hard to change the rear diff oil? I should probably do that soon, and I'm sure as hell not going to pay the dealership to do it.
     
  6. May 8, 2008 at 7:07 PM
    #6
    Ridgerunner

    Ridgerunner Well-Known Member

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    2001 with; cat-back twin exhaust,elbow mod, Westin bullbar with Hella550's, Snugtop XTR camper shell, TRD off-road 2x4-black beauty.
    I haven't done synth, but Toyota carries this stuff I've always heard was the underdog of oil additives and Ive added it almost every oil change since new. It's called "MOC" (simply motor oil conditioner). I know I notice a difference mainly because the two oil changes I didn't add it the "freer-slippier" characteristics of the fresh oil diminished after around 1500 miles....whereas with MOC those characteristics stay all the way through the next oil change. The mileage isn't substantial enough to say, but the performance is smoother and you know you're adding another level of protection-it's all good doing your synthetic thing:)
     
  7. May 8, 2008 at 7:08 PM
    #7
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    Will
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    getting there....
    changing the rear diff oil is easy as pie. when you drain it....be sure to remove the fill plug first(it would suck to drain the oil and not be able to remove the fill plug)and when you refill it....it helps to have one of those small hand pumps, like the kind for refilling a boats lower unit.
     
  8. May 8, 2008 at 7:24 PM
    #8
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    Chad
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    The rear is easy. The front is a pain in the ass.
     
  9. May 9, 2008 at 4:02 AM
    #9
    Janster

    Janster Old & Forgetful

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    I can't say that the synthetics have done much at all..... but when I owned my 96 3.4L tacoma, I had synthetics in everything....tonneau cover, K&N filter, deckplate mod, and only 2" lift on original 31" tires - the truck got close to 20mpg half city/highway. That was about 2mpg increase from it's original gas mileage without all the mods.

    So - in a sense, a bunch of improvements together can help.....

    At this day & age with gas prices - any little bit helps!!
     
  10. May 9, 2008 at 5:02 AM
    #10
    Demoncleaner

    Demoncleaner Well-Known Member

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    TRD exhaust Homemade bed mat & bed extender, front Drings, Short clutch throw, Summer: Stock 17's Winter: Blizzaks on 16' black steelies
    Full syn in everything except LSD rear diff. Don't think it made much mpg diff except in winter since synthetic flows much better at cold temps. Motor break-in is probably biggest reason.
     
  11. May 9, 2008 at 3:07 PM
    #11
    hail-bop Command

    hail-bop Command Well-Known Member

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    I run full synthetic (Mobile 1) and I never noticed anything. As a matter of fact I get about 14 miles to the gallon! I don't know if I wanna laugh or cry....
     
  12. May 9, 2008 at 3:28 PM
    #12
    gdawg25

    gdawg25 Zoom-Zoom

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    I don't know, but maybe it's your 35" tires?;)
     
  13. May 9, 2008 at 3:29 PM
    #13
    hail-bop Command

    hail-bop Command Well-Known Member

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    Yeah I know, LOL or the 488 gears?:D
     
  14. May 9, 2008 at 5:22 PM
    #14
    dustin19d

    dustin19d Well-Known Member

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    AllPro, Armorology, Mobtown, Pelfreybilt
    I recently went to Amsoil in both diffs, trany, transfer case and engine. I don't pay much attention to gas meilage but I can tell you I all runs and shifts much smother now:)
     
  15. May 11, 2008 at 11:57 AM
    #15
    RememberMorrison

    RememberMorrison Yeah, I'm that Guy

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    Anyone have a write up on changing all the fluids. I know it isn't hard but I don't feel like f'ing up anything.
     
  16. May 15, 2008 at 7:42 PM
    #16
    mgaudet7

    mgaudet7 Well-Known Member

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    Saskatchewan, Canada
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    stock except for TRD seat covers
    ya, i would also like to see that write up. Im too cheap to bring it to a garage but i want to make sure i dont screw up.
     
  17. May 16, 2008 at 2:50 AM
    #17
    Roland

    Roland My other ride has sails

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    UnderCover Tonneau, Bed mat, Bug Deflector, aFe Pro Dry S, Secondary Air Filter removed, Synthetic 5W-30 oil, Scanguage II with blendmount, WeatherTech floorliners, Toyota seat covers, Installed OEM intermittent wipers, TacomaWorld sticker, Defrost without AC mod, Hidden Hitch
    Changing it out of the rear differential seems easy enough but I can't find anything specific to changing the oil in my 2.7 I4 5 speed.
     
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