Comments by "John Burns" (@johnburns4017) on "Is Synthetic Motor Oil Better For Your Car?" video.

  1. fully synthetic oils did last longer for sure. Mobil 1 advertised 25,000 mile oil change intervals. But not the modern so-called synthetic oils. Mobil 1 and others did have synthetic oils in that none of it came from a hole on the ground. I think it was Castrol who were using a mineral base oil for their "synthetic oil". Mobil took them to court and the court deemed that Castrol's was fully synthetic. Since then few fully synthetic oils have been on the market. You have to be in the know to know what is a fully synthetic oil. I believe in Germany fully synthetic oil has to have no mineral oil in it. They do not go along with the US court ruling. So, modern so-called synthetic oils break down quicker than the real old synthetics. The vid is right in that many of the additives that are in mineral oils are already in the fully synthetic base oils, so will not break down as quickly. So fewer additives are put in the synthetic oils. The more additives added, the less of the oil which lubricates. 100% mineral oils are now near obsolete being difficult to buy. When fully synthetic oils are available and well priced it is foolish not to use them.
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  2. Is there a vid on transmission/gear box oils?
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  3. fully synthetic oils have greater shear . That is, it is difficult to compress and part. This means it is superior at keeping the metal surfaces apart when under stress. Synthetic oils are thinner when cold ensuring oil reaches the bearings faster. It is not the case that mineral and fully synthetic oils have equal lubrication qualities when new.
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