Niagara Gazette — PRO: It flows easier in cold weather, therefore no loss of prime when the oil is cold. Also, it is highly resistant to viscosity breakdown (the ability of the oil to flow easily in all temps) from heat, friction, and chemical contaminants.
Longer change intervals: 5,000 to 7,000 miles between oil changes (compared to 3,000 for regular oil). Some folks have documented up to 25,000 miles between changes. However, I would not advise going that long! It just makes me nervous based on my experience as an automotive machinist.
CON: Cost is twice as much as conventional oil per quart. However, it lasts longer, so the actual cost increase is closer to 50 to 60 percent.
Flows easily, therefore not recommend for use on high mileage engines; nor do I recommend using it in new engines during the break-in period because it is so slippery and dramatically limits the wearing of new mating parts within the engine. This initial wearing of parts is what makes for proper engine break-in, sealing of piston rings, mating of camshafts and lifters, etc.
Does it make my engine last longer?
Yes, because it is so slippery, synthetic makes for less engine wear and cooler operating temps; thus resulting greater engine longevity. In addition, because of its chemical makeup, it better withstands the rigors of the internal combustion engine (hot, toxic, under extreme friction; sometimes very cold — and thus dry — during winter startup). Good synthetic oil flows better than conventional oil in cold climates because it maintains its viscosity in a wide range of operating temps.
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