I asked in a car forum if anyone has ever renewed the valve shaft seals on a 1.9 16V engine and can give me tips on what to consider. The MX5 of my daughter (260.000 km) sucks oil and smokes and I assume that the smokery comes above all from hard VSD, which I may want to change in winter, especially since motor running and compression are otherwise impeccable. Now, however, one has opened my eyes, what I am for a beginner, because I want to change the engine a mo rinsing and sealing treatment and initially missed a good 0W30 from Aral: Quotation: And of course all wrong done, what you (man) can only do wrong!!! Full synthetic oils have a special cleaning effect, so solve everything to dense oil carbon deposit, with the result high oil consumption. Again my urgent tip: fill the engine with a (cheap) 15W-40 (is on mineral basis) and drive please a few thousand kilometers, so that oil coke again One can see once again how valuable and expensive the oil coal is in today’s times. One cannot have enough of it. People buy cheap oil.