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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