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Thread: Engine oil

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    Engine oil

    Castrol 20w-50 with ZDDP or Valvoline racing oil?

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    Yoda Marvin Gruber's Avatar
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    Re: Engine oil

    I've used Castrol 20/50 since 1976 with no problems.

    Marv

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    Re: Engine oil

    I called Castrol about this and there's been a reduction in the "ZDDP" component in the 20w50 GTX. According to the tech I spoke to, the only one they offer with the amount of "ZDDP" called for is Edge-Syntec Synthetic 5W50. I called Valvoline and they say their 20w50 VR-1 Racing oil(conventional)has all we would need. There's a lot of discussion about whether it's even an issue in an engine already broken in. Other brands that claim to be o.k. : Mobil 1 15w50 synthetic, Amsoil 20w50 Racing(check variety for details), Royal Purple synthetic 20w50 HPS#31250,Brad Penn 20w50 Racing (conventional), and Moss #220-815 20w50. Prices are from about $6. to $10. per qt. There are also additves available. Good luck, Bob

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    Jedi Knight
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    Re: Engine oil

    I think either choice will work fine. I have broken my motor in on some new old stock Castrol 20-50 and will probably use that again for the first oil change. Then I'll be looking at the Valvoline straight 50.
    Things I need:
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    Please PM me if you have one for sale.

    All the pieces falling off my car were engineered to the highest British standards.

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    Yoda John Turney's Avatar
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    Re: Engine oil

    This subject was discussed in some depth recently. In this post I reviewed the amounts of ZDDP in Castrol 20W-50 oils and how it compares to the recommended concentration of zinc in the oil.

    Conclusion: You don't need ZDDP in any of the listed Castrol 20W-50 oils.
    John, BN4

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