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Dumb Mistake

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Chacon, Sep 15, 2008.

  1. Sep 15, 2008 at 7:58 PM
    #1
    Chacon

    Chacon [OP] Member

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    I changed to synthetic oil in my 2009 4 cyl PreRunner according to specifications it requires SAE 5w-20 or 0w-20. I made the mistake of looking at the bottom of the page at the specifications of the V6 which, ask for 5w-30. Is there in any problem with running 5w-30 for 3000 miles and then swapping it or should i take a loss and dump the oil and purchase 5w-20 or 0w-20?
     
  2. Sep 15, 2008 at 8:02 PM
    #2
    JJ Customs

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    Man does it really call for 5W-20? I had a hard time convincing myself to go from 10W-30 to 5W-30 in the 07 4.0. If I were you I would stay with the 5W-30 bro.
     
  3. Sep 15, 2008 at 8:09 PM
    #3
    luk8272

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    I'd stay it should be fine.
     
  4. Sep 15, 2008 at 8:09 PM
    #4
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    5w30 is fine....absolutely fine. with the 5w20....you supposedly get a tiny bit better mileage, but i still think 5w30 protects better.
     
  5. Sep 16, 2008 at 7:55 AM
    #5
    CometKat

    CometKat Well-Known Member

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    The original spec on the engine was 5-30(from what I read at TN). Then it switched to 5-20 or 0-20. I suspect the engineers determined that the variable timing works better with the lighter oil. I’d switch it out to the correct spec. The cost is nothing compared to what you spent on your new truck.
     
  6. Sep 16, 2008 at 7:08 PM
    #6
    allrsdup

    allrsdup Well-Known Member

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    u should be fine. i had a 99'taco with a 2.7 and back then toyota recomended 5-30 only now do they tell u to use the 5-20 for fuel reasons
     
  7. Sep 16, 2008 at 8:19 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The VVT-i requiers the thinner oil in the 2.7. Switch it out as soon as you can. :)
     
  8. Sep 17, 2008 at 7:26 AM
    #8
    Caddmannq

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    Brand new engines with close tolerances can use very thin oils. As componants wear though I think you guys wll all be switching to thicker oils like 10w-30 and 10w-40.
     
  9. Sep 17, 2008 at 7:44 AM
    #9
    S_A_Aceman

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    I just got my truck back from getting the timeing cover TSB completed, among other things, and the dealer put in 5w30 Mobile 1 synthetic. So I would assume 5w30 is fine.
     
  10. Sep 17, 2008 at 9:40 AM
    #10
    CometKat

    CometKat Well-Known Member

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    We are talking about the I4 not the V6
     
  11. Sep 17, 2008 at 10:04 AM
    #11
    S_A_Aceman

    S_A_Aceman KS National Guard

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    OK... I knew that, but slipped my mind from the time I read the post and when I was able t oreply... pretty busy at work today. BUT.. their is no real diffrence
     
  12. Sep 17, 2008 at 4:24 PM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The 2.7 motor requiers the thinner oil for it VVT-i. It does not use the same 5w-30 of the 1GR-FE (V6). Engine oil pressure is applied to an actuator to adjust the camshaft position. Useing a different weight oil other than what is specified by Toyota could have advers affects on the VVT-i system.
     
  13. Sep 17, 2008 at 4:45 PM
    #13
    Caddmannq

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    Maybe, but actuation better be based on a position sensor and not the viscosity of the oil. Absolute viscosity changes with temperature widely.

    I think they spec 5w-20 because the 4cyl. engine is smaller and therefore can be made to hold tighter tolerances tan the V6, plus it's more focused on economy. Remember that because of CAFE standards, auto makers have to get the max possible economy out of a large volume of tiddlers, so theyt can sell a handful of high profit luxury vehicles with poor economy.

    (OK, in truth I don't know if they ever applied that law to light trucks, but that 4-banger is in the Camry too, right?)
     
  14. Sep 17, 2008 at 5:21 PM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Im sure it also has to do with efficiency. i dont think the tolerances are any smaller than on the V6. FWIW, every VVT-i and i-VTEC engine I have seen specifies 5w-20 for the engine oil. My other Tacoma had the 2.7 non VVT motor and it specified 10w30 oil.
    Yes, the actuation is "based" on position sensors, tps, etc., but the physical actuation is accomplished via oil psi. Since thicker oils build pressure at a different rate than thinner oils, running a thicker oil is going to affect the VVT-i system.
    And, the 2.7 is only in the Tacoma/Hilux. Recently it has been added to the Highlander, but in a much different state of tune.
     
  15. Sep 17, 2008 at 6:13 PM
    #15
    S_A_Aceman

    S_A_Aceman KS National Guard

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    The 4.0 has the same VVT as the 2.7.... I honestly think we are at about the same point in this conversation as we would be if we were talking about different oil brands. There are some good points being made like better economy requiring closer tolerances, and therefore thinner oils. But if that helps the smaller engine produce more efficiently, then would it not do the same for the larger engine? If we eliminate the VVT system, thicker oils, up to a point, WILL produce better protection by providing a thicker cushion. The VVT systems are designed to work on pressure transfer, and pressure is built by volume. Thicker oils will have lower flow, so slower response to pressure requirements. So, theoretically, thicker oil will produce a performance "Lag" when kicking in, as well as a "Lag" in reducing that performance back to an economical mode. Therefore... thicker oil COULD reduce gas mileage.

    Does that make since? Other than all of my crappy spelling...
     
  16. Sep 17, 2008 at 6:42 PM
    #16
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    It makes complete sence. All Im trying to say, is that all the 4 cylinder Variable Valve Timing engines I have seen, they ALL have required the use of 5w-20 oils. Why the 1GR-FE does not, I dont know. Im not going to experiment with different weight oils in a VVT engine when all the litterature I have read states that there is no flexability in the use of different weight oils in these motors.
    Where did you find that the 2 motors use the same VVT? Being different engines of different states of tune, this cant be. Simmilar, yes. Same, no.
     
  17. Sep 17, 2008 at 6:59 PM
    #17
    S_A_Aceman

    S_A_Aceman KS National Guard

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    Well... I guess 'same' is a huge statement. The function of the VVT system in similar years of toyotas is identical. The way it is implimented, and thus tuned would most definately be different. Toyota isnt going to recreate the the wheel every time they build an engine. I cant think of a reason for one engine to use a diffrent oil at all. I canimagine that a VVT engine could specifically not use synthetic oils, since the molecules in synthetics are smaller, causing pressure bleedoff. But... Ive never seen that stipulation.
     
  18. Sep 17, 2008 at 7:02 PM
    #18
    Caddmannq

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    No doubt that thicker oils will reduce gas mileage as long as you're comparing identical engines with identical wear.

    As for the VVt reqt's. I'll have to look into that. I really don't know much about the system other than the theory of why it works. Certainly nothing about the technique of how it works.

    Also I did not mean the the I4 was made to closer tolerances than the V6 (though it might be) but that the shape and size of the I4 engine contributes to its maintaining those tolerances better than the V6 as it heats up and cools down.
     
  19. Sep 17, 2008 at 7:08 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    I havent heard anything about the synthetic oils being a smaller molecule, thus causing pressure bleed off. I guess that depends on how they are made. I think the bleed off is more in relation to the weight of the oil rather than its molecular composition. Then, most "Synthetics" are a blend useing Dino base stocks, so the "smaller molecule" theory would be moot.
     
  20. Sep 17, 2008 at 7:09 PM
    #20
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Gotcha. :)
     
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