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Hope this question has not been asked before. My understanding is Pennzoil Gold is a blend of synthetic and conventional oil. So is the 0w20 a mixture of 0w20 synthetic and 0w20 conventional? If so, why is 0w20 conventional oil not available.

I have a 1992 Miata that I only put about 400 miles a year on it. I changed the oil last month. Do I need to change the next year or will the oil be good for a few years. I only drive it on nice days and sits in the garage.

Went by Napa today. Valvoline 0w-20 is MS-6395 Chrysler approved oil. But Napa 0w-20 is not! So is there has to be a difference in the two oils or Napa has not done the two year trail or paid Chrysler? Mark

Bought a Fiat 124 Spider Abarth. It requires Chrysler MS-12991 oil or it recommends it. It took me forever to find the oil. Found it on Amazon. Pennzoil Euro 5w40. Is this the only only it will take, or will any Euro 5w40 work with it? Mark