The sludge problem is not caused by the oil or 10K changes, unless the wrong oil is used.
In a car with a known sludge problem, I would agree that 10K is too long. I would also use only synthetic, even if the manufacturer did not specify it.The sludge problem is not caused by the oil or 10K changes, unless the wrong oil is used.
In a car with a known sludge problem, I would agree that 10K is too long. I would also use only synthetic, even if the manufacturer did not specify it.