I have a 1994 caprice, 5.7l tpi, 120,000 miles, runs good, What would be the best type and viscosity of oil ?

To start using in this car, for the longest rest of its life?, Oil, Filter,?, I live in OregonI have a 1994 caprice, 5.7l tpi, 120,000 miles, runs good, What would be the best type and viscosity of oil ?
Oh my gosh, you live in outreaches of Oregon and the guy above advised 40W? *Not in your lifetime. The factory recommended oil to use is 5W-30 year round. You can't beat AC-Delco, NAPA (made by Wix) or Wix by name oil filters.





I can imagine you have wide temperature swings. 5W-30 allows the oil pump to force the greatest *volume of oil to frictional surfaces quickly. Hot or cold start-up is where 80% of engine wear occurs. It's to your motors advantage to receive instant lubrication instead of an oil pan filled with ';molasses'; - 40W.





Light oil, (5W-30) also cools internal engine parts faster and more efficiently than heavy thick oil.I have a 1994 caprice, 5.7l tpi, 120,000 miles, runs good, What would be the best type and viscosity of oil ?
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40w