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m the late cleaning phase, 750 miles and using Delo 400 15w40 and ARX, to clean out a Civic that is approaching 380k miles having never had the head off. I talked with Frank at the beginning of this project and am going to report the details back to him when I'm done. So far the oil consumption has gone to zero over the last 500 miles, from a quart or so ever 1k miles. I've been using FP during the test but not LC, pre Frank's request. Last tank the mileage shot up from 39 to 44 mpg over 367 miles (8.27 gal). Before I claim an overall increase in mileage, I'll calc it over three or four tank fulls. So far the results are great and under the oil fill cap it looks like a new engine. If this is how ARX works, it gets my vote for a product that does what it claims to do and is well worth the price.