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  1. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    Mobil1 'FS' oils are definitely full synthetic and on the shelf
  2. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    Because the Toyota engineers already specified the heavier weight oils as used in ROW specs, but were then asked to compromise to improve fuel economy. Management probably posed this question to them, "how thin can we really go and most probably not run into lubrication issues". This was then...
  3. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    So your criteria for a good oil is one that is low in detergents such that it doesn't carry the burnt hydrocarbons (gasoline residues) back to the oil filter. Dark oil does not mean that the oil is burnt.
  4. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    Looks like the mystery oil additive actually diluted the 'Good" high pressure oil additives of Moly, Ca, Magnesium, Phos ands Zinc and also a slight dilution of the base viscosity.
  5. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    Doesn't get cold enough for 0W in Texas, even in the panhandle and 20 or 30 hot viscosity makes no difference with respect to outside low temps.
  6. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    I high quality 0W-30 is just fine and beats the 5W-30 if driving in very cold temps. Only negative of a wider range is that more VI's are used and this tend to breakdown over time. However the highest quality Group IV and V true synthetics use more stable polymer chains to begin with in the...
  7. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    Thanks! The discounts do vary by selling dealer. I paid $9.87 for 12180-0H012 through McGeorge Toyota Parts
  8. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    12180-0H012
  9. Julian73

    Update: 5W-30 & Heavier Recommended RoTW

    You realize that it was Mobil that filed the law suit against Castrol for claiming that the Castrol Group III mineral oils were not a true synethic, that only Group IV and V PAO and Esters were true synethics. Yes, Mobil lost the law suit as being too righteous, as no oils are pure as they all...
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