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My neighbor has 5 quarts of old oil that is sealed. Age is unknown although is in modern plastic bottles and not cans! I run 5w30 in my Acura, would 10w30 for the rest of the summer be a good idea. I am due for an oil change and currently looking for a job..

1972 Impala with a 350. When the engine was done about 6 years ago my engine builder said straight 30 weight. Last fall it wiped a cam lobe, and he said it was the fact that zinc was taken out of oils and causing cam failures. He told me to use Rotella 15 40 as has zinc. My normal mechanic says...