The manufacturer of my car recommends that Mobil 1 be used. After a recent service at the dealer I noticed that a Penzoil synthetic oil had been used! I contacted Mobil and asked them their thoughts, they responded by telling me that for the short term no harm will be done but to change back to their product soon. The dealer tells me that ALL synthetic oils are produced by Mobil and they just supply the product to all under licence...
Anyone like to comment?