You would have to look them up individually to know what is a group 4 synthetic, a group 3 synthetic, a group 4 & group 3 synthetic blend and a group 4 and group 2 synthetic blend or a group 3 and group 2 synthetic blend.
Castrol was sued by Mobil to quit using the word "Synthetic" while advertising their group 3 oils. Castrol won and the words "synthetic and synthetic blend" can mean a lot of things.
It’s been 10 years since the National Advertising Division of the U.S. Council of Better Business Bureau adjudicated on a dispute between Castrol and Mobil on the use of the word “synthetic” as a description of certain lubricants.
The disagreement was over an advertising claim that began when the U.S. Mobil objected (despite allegedly having marketed hydroisomerised API Group III base oils as synthetic in Europe and elsewhere) that Castrol’s hydroprocessed Syntec® was not synthetic.
The NAD did not agree, ruling that Castrol’s evidence, although not demonstrating its product’s superiority, constituted a reasonable basis for the claim that the Castrol product, as then formulated, was a synthetic motor oil.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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