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#1
30-05-16, 20:45
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If you run the diesel grades of oil (look for a diesel rating like CD, CE or CJ or whatever revision they are up to now) they will have sufficient ZDDP. Shell Diesel oils are fine. Same will go for the oils Canadian tire sells for high mileage gasoline engines.
Any of the gasoline engine oils with ratings after SL will not have the ZDDP needed. You can buy a ZDDP additive off ebay for about $10 a bottle, but have to mix it accordingly. Too much isn't good either. Boss lubricants also sell the older spec oil, but it isn't cheap. 
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#2
30-05-16, 21:27
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My truck is a diesel and runs Rotella T 15-40 so I have that in stock.
Is that OK ?
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#3
31-05-16, 03:00
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Yes it will be. If you google the subject on ZDDP, I know there is a chart on there somewhere where they analyzed the Zinc levels in a bunch of diesel oils. Surprisingly Walmart almost came out on top, although that oil is packaged regionally so the results could vary depending on what refinery is packing their bottles. It is one of the few things at Walmart that doesn't come from China (yet).
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#4
31-05-16, 23:27
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You will find an effective ZDDP additive at your GM dealer under part no. ...#992869 . They call it EOS.
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