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The specs call for 5w-30 and is backward compatible to 5w-20 but I wouldn't recommend it. Unless you have issues with it using oil, the 5w-30 is what I would run in it especially in the Texas heat. Thinner oils collect and release heat faster than the heavier viscosity oils. If it's using a little oil, move up to a 5w-40. The 5w means it will get into circulation a lot faster than a 10w or a straight weight oil. It only comes into play on cold start up. The wider the spread, the more chance there is that the formulator has used a polymer of some sort to make it. So a 5w-30 may not use any Viscosity Improvers but the same line of oil in a 5w-40 may use a lot. Polymers are known to sludge over time. My 91 Bronco with 130,000 miles on it uses maybe a half a qt in 5000 mile changes. I'm using a 5w-30. I've ran the heavier oils only to watch the fuel mileage go down and the heat go up per laser probe. Coolant temps stay the same but the metal is running hotter. Choose wisely grasshopper.
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