ZDDP in Castrol GTX 10W-40

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I was wondering if anyone knew the levels of zinc and phosphorus in Castrol GTX 10W-40? I called and they said they could not give those numbers out? Thanks, Drew
 

JT1

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Pretty much the same as there 5w30, just a different viscosity. What are you using it for anyway?
 

soundwavefd

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Originally Posted By: JT1
Pretty much the same as there 5w30, just a different viscosity. What are you using it for anyway?
Mazda RX-7.
 
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Neither it nor the HM version is any higher in ZDDP than any other SN oil from what I've seen in UOA's. If you want more ZDDP you might check out Quaker State Defy or Rotella.
 
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