I would use 10/40 which is a good all around oil. If you are not breaking in a new engine then you can use the current oil or the high mileage stuff if you can find it. You can also use synthetic as well. If you are breaking in an engine then get something similar to EOS available at any GM dealer to add to the oil and lube the cam prior to running.
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Thursday, June 10th, 2010 AT 6:04 PM