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My expirience with 1998 Z3 1.9L is that Pentosin 5w30 runs cleaner without consumption. Only has 58k miles; but tried Mobile 1 twice. Each time I consumed 1 liter per 1000 miles with an increase in upper valve / cover varnish. Each time I switched back to Pento the consumption stopped, and the deposits went away. FL. driver, mixed highway, slow beach cruzin.. Tried Pento as recommended by German / Turkish shop owner / tech in Tampa....he was right......at least for my Z.
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