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Which oil fully synthetic or not

  • 12-11-2013 11:43am
    #1
    ronn
    Registered Users, Registered Users 2 Posts: 1,069 ✭✭✭


    What sort of oil do I put in a 2005 Mazda 6. I know it's 5w/30 but I don't know if I should put fully synthetic or non synthetic.
    I've checked the manual and it just says 5w/30.
    Thanks ronn


Comments

  • #2
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    Semi-synth is just fine. You'll hardly even find a pure-mineral 5W-30 at this stage.


  • #3
    ronn
    Registered Users, Registered Users 2 Posts: 1,069 ✭✭✭ronn


    jimgoose wrote: »
    Semi-synth is just fine. You'll hardly even find a pure-mineral 5W-30 at this stage.

    Thanks Jim
    What's pure mineral mean ?
    What's the difference between the two types of oil.


  • #4
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    ronn wrote: »
    Thanks Jim
    What's pure mineral mean ?
    What's the difference between the two types of oil.

    Pure mineral, a.k.a. "Dinosaur", is oil based on petroleum crude without any synthetic polymers. Full-synthetics are formulated and manufactured in the lab by men with very white coats and suspiciously thin spectacles and are optimised for the requirements of an engine environment. A semi-synth is a blend of the two, usually about 70-80% mineral, and is perfect for most petrol cars a few years old.


  • #5
    Chimaera
    Registered Users, Registered Users 2 Posts: 1,652 ✭✭✭Chimaera


    Some semi-synthetic oils are petroleum oils that have been chemically modified, rather than being synthesised from scratch. It's a cheaper way to get a decently performing oil. Very few modern cars can tolerate mineral oil and anyone who tells you they can is probably trying to con you.


  • #6
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    Chimaera wrote: »
    Some semi-synthetic oils are petroleum oils that have been chemically modified, rather than being synthesised from scratch. It's a cheaper way to get a decently performing oil. Very few modern cars can tolerate mineral oil and anyone who tells you they can is probably trying to con you.

    Aye. The base oil in a full-synthetc, despite the name, usually comes from petroleum gas. Although I've been hearing that Mobil use reformulated ethanol.


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  • #7
    Sidewayslarry
    Registered Users, Registered Users 2 Posts: 84 ✭✭Sidewayslarry


    A little off topic from the original post, but where are these gallons of oil for €10 coming from, the autofactors are all coming down with cheap oil at the moment, and the last time I was in my local factors they had Elf Semi Synthetic 10W40 for €12 a gallon. The Castrol in comparison was €40 for their 10W40 Semi Syn. It must be cheap recycled oil or something but in the 10 minutes I was in the autofactors, at least 3 mechanics came in and bought the cheap oil! I suspect to put in customers cars.......


  • #8
    Tea drinker
    Registered Users, Registered Users 2 Posts: 2,817 ✭✭✭Tea drinker


    Sidewayslarry wrote: »
    A little off topic from the original post, but where are these gallons of oil for €10 coming from, the autofactors are all coming down with cheap oil at the moment, and the last time I was in my local factors they had Elf Semi Synthetic 10W40 for €12 a gallon. The Castrol in comparison was €40 for their 10W40 Semi Syn. It must be cheap recycled oil or something but in the 10 minutes I was in the autofactors, at least 3 mechanics came in and bought the cheap oil! I suspect to put in customers cars.......

    AFAIK Elf has a good name. It's 27 yo-yo for 4l semi synth on micks garage


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