Compression Ignition Addict
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The hot fluid can never be as cold as the cold fluid in heat exchanger application (when everything is fully up to operating temps). You will always have a higher temperature for the oil than the coolant. It may only be a few degrees, but if your gauges say they are the same temperature, then you have a calibration error (may not be a large error, but it is inaccurate none-the-less).
Ford's rule of thumb of 15*F delta is exactly that - a rule of thumb. Nothing magical about the 15*F, it is just where Ford decided that it was a statistically valid point for being concerned. There are conditions that must be met for it to be valid also - one is that the coolant must be up to temperature (190).
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Last edited by bismic; 05-17-2011 at 06:24 AM.