Thread: castrol magnatec 10w 40,good or a bad oil
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Old 08 April 2010, 05:19 PM
  #28  
oilman
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Pretty much. To be more specific, 10w-40 for standard or near standard classics, 10w-50 for modded or thrashed ones, 5w-40 for standard up to quite heavily modded new age, 10w-50 for heavily modded or track only new age.
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