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Re: motor oil
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Posted by Gerald on February 18, 1999 at 19:56:21:
In Reply to: motor oil posted by Wayne Gulliver on February 18, 1999 at 17:30:04:
10W30 is 10W oil with additives that keep it from thinning as much as plain 10W would so that at high temperatures its just thinned as much as 30 would have. That's what the numbers mean. A Super C would have expected non-detergent oil. Modern oils make engines last longer. Detergent helps keep the engine clean, other additives cut down on corrosion of copper and tin in bearings. Old plain oils didn't protect engines nearly as well. Whitish scum probably comes from water in the oil. Either from a leak of coolant to the oil (head gasket, hole in the block) or from not getting the engine hot which could come from lack of exercise or from a faulty or missing thermostat. Getting the engine up to temperature with the thermostat is important to boiling the water from condenstation out of the oil. Water is a normal combustion product that will work its way down the cylinders to the crank case, but if you get it to normal operating temperature that water should boil away. Gerald
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