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As you and I have spoken before, I had my oil changed a week ago since this last Friday. I went about 650 miles and the monitor said to check the engine oil level. One quart of 20w-50 was added today and that puts me about half way between the two lines on the dipstick. Once again, the engine runs great, there is no smoke; however, I tend to go 80-100mph on the highway w/o thinking about it. Kurt, even if there is excessive valve clearance, or worn valve guides, do I realistically need to either rebuild the engine, trade it in, or could I simply add oil and change the plugs more often if necessary and simply go about my business without hurting anything? There is no smoke and no funny noises.