oil choice

Discussion in 'Oil' started by bubbu, Apr 5, 2014.

  1. bubbu

    bubbu Member

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    I have been using Castrol synthetic 20/50 in my 87 1100 sporty and someone told me I should'nt use that in the harley. They said to use harley oil or even oil that is for diesel engines other than the Castrol. I didn't disagree with him because I never heard that before. Any feedback would be helpful, I hope I haven't been putting in the wrong oil and doing any kind of damage to the bike. Damn.
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Baloney, from a H D factory rep and a good friend of mine a H D tech Castrol is fine, we ran it in our EVOS for years
     
  3. bubbu

    bubbu Member

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    Isn't there some difference in the Api rating or is that a crock too?
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    SG will work fine for you, Castrol 4T 20-50 is OK Harley Davidson Forums
     
  5. Breeze3at

    Breeze3at Well-Known Member

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    Air cooled engines need more phosphorus and zinc than water cooled. Motorcycle specific oils usually have that. I used Castrol GTX 20/50 in my '87 Sportster for the 15 years I had it, & it's still running. I used GTX in my '92 Dyna for about 50 K miles, & it still runs like a new one. Oil with a diesel rating (like Shell Rotella) is also good. There will never be an agreement or an end to the oil discussions.
     
  6. Jack Klarich

    Jack Klarich Expert Member

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    That is why I like Castrol being SG rated it has the levels of zinc needed:D
     
  7. bubbu

    bubbu Member

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    Thanks guys, that will do it for me. Now off to see my bud and enlighten him.