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2186 Views 6 Replies 5 Participants Last post by  MorrisTigerson69
what are the advantages and disadvantages of using 15w50 motor oil? I've got a 1989 560SEC with about 30,000 miles on it.
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Hi MorrisTigerson69

Use 20w50 in summer and 10w30 in winter. Use a good brand like Castrol GTX or Castrol Syntec Blend. They are moderately priced. Mobil synthetic is very expensive and may have a lot of polymers. Advantages and disadvantages are explained by our friends in the earlier posts. It is still the same as in 1990s.
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