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Message: [QUOTE="TARM, post: 348087, member: 578"] Either 7000 or 9000. If you want to stay with a 15w40 go with 7000. If you want a 5w40 and 100% real syn go with 9000. Then if you want to see how things are going do a basic UOA from Schaeffers to see if there are any issue or when you actually need to change the oil or add the additive if everything else checks out and you want to handle the shearing.( Schaeffers has a test kit and their own lab, most dealers have them or they will send you one in the mail.) If you go to their site and look up the data articles they have for the various oils the data sheets will tell you the average where the various oils start with the different additives and viscosity etc... If you want to get really accurate you can send in a virgin sample of the oil as well that you used and then you can really know you have a accurate before and after. Its not to much money. I get some free ones as I order a good amount for all our vehicles and some friends I serivce so I am not sure on the exact price currently. Yes to the additive to any oil. [/QUOTE]

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