Driven oil viscosity chart1/1/2024 When referencing splash-lube engines, I will assume you are referring to early automotive engines like the Model A’s four cylinder that used scoopers located on the connecting rods to pick up oil from the oil pan. (Image/ Driven Racing Oil) Viscosities & Bearing Clearances for Oil “Splasher” Engines Note that as bearing clearances increase so does the viscosity of the oil recommended. This is Driven’s viscosity chart that offers suggestions for oil viscosity based on engine types of iron or aluminum blocks and also bearing clearances. Plus, a higher oil temperature also helps to reduce sludge buildup inside the engine which is caused when water mixes with oil and solidifies. Water easily combines with acids and if allowed to concentrate can cause bearing etching difficulties for the engine. Water enters the crankcase as an inevitable byproduct of combustion. But remember that 212 degrees F is where water evaporates which turns the water into steam where it can be removed via the PCV valve. Synthetics are a great alternative if the temp concerns you-or you can add an oil cooler to keep temperatures in line. As long as the engine oil does not spend too much time above 225 degrees F, a mineral oil is fine at 210 degrees F. A 210 degree F oil temp is just about right for most street engines as oil temp will almost always be higher than coolant temperature because oil is also cooling the engine. In regards to your Corvette-a 5w40 is likely a good selection but there are many levels to the relationship between oil temperature and oil viscosity. Now if I change thermostat and when electric fans come on it will help to thicken the oil and increase the oil pressure. Fortunately it has an oil pressure and engine oil temperature gauge so I can and will be shortly switching to 5w40 synthetic from 5w30 synthetic. On a different note, my ‘89 Corvette runs hot, oil temps over 210 and if I’m driving it hard they go even higher. Would you look at using the same table of clearances and oil temp for an old splasher engine? In the 0W-40 example, “40” signifies average viscosity, which guarantees optimum performance even at high temperatures.I read your story on what weight oil to use for a certain bearing oil clearance. In extremely hot areas, even an oil classed as “60” can be used, as it is highly viscous in its normal state. 10 would therefore represent very low-viscosity oil which is specifically designed for cold regions. The second part of the viscosity grade (the number after the “W”) indicates how viscous the oil is at high temperatures: the higher the number, the thicker the oil film. “0W” therefore denotes extremely low-viscosity oil, for use at low temperatures. The number before the “W” (Winter) indicates how viscous the oil is at low temperatures: the lower the number, the better the oil's fluidity. These specify the operating temperature range for which the oil is best suited. For multi-grade oils, this covers two grades e.g. The numbers above the oil application range define its SAE (Society of Automotive Engineers) class. This results in greater lubrication when starting the engine from cold, reduced strain on the starter motor at low temperatures, and adequate lubrication at higher ambient and engine temperatures. They can maintain an optimal supply of oil to the engine in both hot and cold conditions. With temperature having little effect on their viscosity, multi-grade oils are better suited than single-grade oils to covering a wider temperature range. polymers such as polyester and polyisobutylene), so that their viscosity is only slightly reduced at higher temperatures. They are based on low-viscosity base oils and mixed with special additives (e.g. Multi-grade oils are the engine oils commonly used today. Their optimum performance makes these oils particularly suitable for high-performance engines such as the engine in your Porsche. Synthetic oils are manufactured by chemical synthesis and can be given very specific quality-enhancing properties. Semi-synthetic engine oils are considerably better quality, especially regarding their aging resistance and thermal properties. They can be manufactured relatively easily and cheaply by distilling and refining crude oil. Mineral oils are the most widely-used base oils. There are basically three different classes of engine oil, each with different properties.
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