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Message: [QUOTE="TARM, post: 91523, member: 578"] Change oil types??? Why?? You have [B][COLOR="Red"]6K miles!! [/COLOR][/B]on a cheap quasi syn that is know to shear faster at higher mileage then other higher end real syns!!!! Before you go changing things up, first try changing your oil a maximum of ever 5K. If you tend to be a spirited driver many on here would be changing their oil even sooner. Unless you are doing UOA you really have no business going past 5K on any oil. Yes things like oil consumption and foaming, shearing will all go up faster at a certain point as you are using up the additive packages in the oil and wearing down the base oils properties as well. The lower quality the oil the faster this will happen. Once the oil warms up there is very little difference in viscosity of a 15w40 and 5w40. After all if there was what would be the point of the range system they give for oil vis? Different oil vis for different environmental temps has to do with the cold range vis not the hot temp vis. Now there certianly can be differences in oil additives such as ones that prevent foaming as well as the quailty of the base oils going from one oil manf or line of oils and another. With a HUEI motor it will clearly tell you when you have gone to long with OCI if you are observant of how your engine runs. By 6K with Rot its would be trying hard to get your attention. Just think about what happens to the oil in a HUEI the harder you drive one. Think about what it goes thru compared to other diesels that are non HUEI. Not to mention how much you are decreasing the life of your injectors by running oil for longer OCI. [/QUOTE]