Clean injectors before an oil change
The chemicals in most cleaners can seep into the oil and given that it breaks down oil deposits and such it can do the same to the oil. Many recommend that if used, it should be used a couple of tanks of gas before you drop the oil. Can not say if they are right or wrong but seems worth running a couple of tanks of gas just to be sure that any "add to the gas" solvents are out of the tank. Obviously, if the engine is tight then there is less chance of the solvent getting into the oil...
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