2014 Thunderbird Commander Oil

Discussion in 'Thunderbird' started by whitelee28, Feb 24, 2021.

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  1. whitelee28

    whitelee28 New Member

    Mar 26, 2019
    Good afternoon All,

    I am getting ready to do an oil change on my 2014 Thunderbird Commander. The book says i can use Castrol 4t 10 40 or 10 50. What you you guys recommend? The reason i ask is for some reason the 10 50 is cheaper than the 10 40 for some reason. A 6 pack of the 10w 40 is 72 bucks and the 10w 50 is 53 bucks. Any advice you can give would be much appreciated.
  2. Helmut Visor

    Helmut Visor Only dead fish go with the flow

    Oct 3, 2018
    Three Counties
    Can't help I'm afraid but hopefully someone will pipe up soon enough, however from what I understand 10w50 is slightly thicker when up to temperature so if you're in hotter climates I might be tempted with that (no real knowledge though)
  3. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

    Dec 12, 2016
    Norfolk UK
    #3 Tricky-Dicky, Feb 25, 2021
    Last edited: Feb 25, 2021
    I would suspect that 40 viscosity is actually recommended, and I would think more like 30 is the makers' recommendation, all using higher viscosity will achieve is to slightly increase oil pressure and higher loads on the oil pump and its drive, It can be beneficial on a very high mileage engine with increased clearances and low oil pressure but on a good motor its really not needed, if you're using a synthetic oil then it will handle high temps anyway.
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  4. Alatamoc

    Alatamoc Senior Member

    Mar 29, 2019
    10/40 semi synthetic is what I've used in all of my three Thunderbirds to date.
  5. whitelee28

    whitelee28 New Member

    Mar 26, 2019
    Thank you all for your input. Looks like I am going to go with the 10-40.
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