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Now I had to clear this out myself because there are different Castrol SLX 0W-30 oils in shops. I found at least LL-01, LL-04, VW longlife and Volvo longlife. I asked from Castrol Finland if the oils are different or are they same oil just in different bottles. The answer is that they are different oils. They all are SLX 0W-30 but there are different additives in the oil. So the answer for the first question is that you really should change your oil to correct one.
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