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  1. P

    A3/B4 and C3 oils

    Can I mix oils with different ACEA specifications, specifically a3/b4 and c3 oil?
  2. P

    Importance of OEM specifications (505.01)

    Hello everyone. I just bought '99 Passat 1.9TDI with Pumpe Duse engine that consumes some amount of oil between changes. So, my question is, can I use 10W40 or thicker oil without 505.01 specification and will I make it worse if I don't use required oil?
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