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Can I mix Castrol Aviator S grades with Castrol Aviator AD grades?

April 26, 2017AD Aviator castrol grades mix

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Can I mix Castrol Aviator S grades with Castrol Aviator AD grades?

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Yes, all approved SAE J1899 and SAE J1966 oils should be compatible. The most common reason for needing to mix oils is following the replacement of a cylinder on a mid-time engine which has been running on a Castrol Aviator AD grade. Following the cylinder replacement it is normal to switch to a straight Castrol Aviator S grade for one or two changes to break in the new cylinder. Once the rings are properly seated you can switch back to Castrol Aviator AD.