| When you get into oils in this grade you'll hear phrases like " viscosity break down ". Viscosity can be defined as a fluid's resistance to flowing freely as a result of its internal molecular construction. Viscosity is perhaps the most important property of a lubricant. It controls the formation of lubricating films under both thick and thin film conditions. It affects heat buildup, governs the sealing effect of oils and oil consumption, and significantly affects engine startup at extreme temperatures. Synthetic oils are thermally more stable than conventional oils. Synthetic Oil does not evaporate as readily and has 10% better heat transfer than the Petroleum based lubricants. With this higher protective thermal rating, it is tested to extremes. Like far greater RPM levels that run for much longer durations then what will ever be used on the public roads. Which breaks down to you would need to run your motor at 10,000 rpm's for about 10 hours straight to start to wear a Synthetic Oil down. So in other words, you will change the oil not because of break down. But because oil gathers contaminants of dirt, metals So you can get Amsoil, Redline, Royal Purple, Mobil One, etc, etc. It really doesn't matter for commercial use. They all have such a high boiling break down point that their main design was for racing. So pay $4.50 a quart for the Mobil one or spend $7.00 for a quart of the pure racing oils. Either way your more than protected.
1991 300zx TT Stg IX+  1994 Supra T 67k miles SP77HO Full turbo kit  2002 Mustang Convertible GT 2002 Expedition XLT 4x4 Triton V8
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