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In the past, fitting an oil cooler was mandatory once an engine had been even slightly uprated. The main cause for this was the quality of Motor Oils available at that time. If the oil temperatures exceeded a specific point, then engine failure was almost guaranteed. Modern motors oils are generally of a much higher quality, especially the recognized ‘names’ and have far superior high temperature tolerances than those of 10 or 15 years ago. Fully synthetic oils have an extremely high temperature tolerance. Use of any of these oils makes an oil cooler less of a necessity where engine outputs do not exceed around 90 horse power. It is as bad to run the oil temperature too cool as it is to let it get too hot. The ideal operating range is 200°F to 230°F (sump temperature). At these temperatures the oil is working efficiently to produce best power, economy and release of combustion by-products. If the oil is too cool, these by-products are absorbed into the oil requiring frequent changes to avoid bearing and bore damage. It is worth noting that keeping the oil at the correct temperature helps cool the engine generally. High oil temperatures will create higher water temperatures. Various sizes of oil coolers and fitting kits including pipes are available.
To help control oil temperature there is a thermostat available that fits into the engine cooler pipes, it operates at 74°C (165°F). This can not be used with the steel braided pipe set. An oil temperature gauge adapter is also available that fits into one of the cooler pipes, not compatible with the steel braided pipes.