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New cars and truck manufactures recomend differend types of grades of oil when the engine is new. What they don't tell you when the engine receives 30,000 miles on it the grade of oil can be changed for better lubrication. Use 10w30 for normal use upon changing oil.
The oil doesn't leak from the head gasket, Unless it is broken. The oil is inside the engine, the head gasket seals out the water from the cylinder walls, and keeps the compression in. No oil, It could be coming from the rocker cover gasket just above the heads. They always leak. The engine sits at a slight pitch to get the oil out and down. And it usually leaks at the rear the most. Changing those gaskets is a job, you have to remove everything up top of the engine to get to them, then seal up the spark plugs too if they are in the covers. I did mine a few years back and they are just starting to leak again. It only has 250,000 miles, go figure. Check it out, hope this helps.
these engines are notorious for sludge problems, however that's unusual that an engine with low mileage has an internal problem. the oil itself doesn't matter that much. you should be fine with any brand 5w30 or 10w30. im interested to know what inside damage your talking about.
No different from any other oil change, just reset the oil life on the dash if it has one which i believe it does. The oil grade is 5W-30 on the turbo engines and 10W-30 on the non turbo engines. If you like you can go with the synthetic oil which will give you up to 25,000 miles or 1 year before service, but you do have to replace the oil filter every 5,000 to 7,000 mile and top off the synthetic oil which in the long run be cheaper then changing the oil andfilter every 5,000 miles or six months for turbo and 3,000 to 4 months for non turbo engines. Good luck and hope this helps.