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What weight oil should be used in a 1998 Chevy venture with close to 84000 miles on it?

The recommended oil weight for a 1998 Chevy Venture depends on the climate where you live. The owner's manual is the best source for this information, but generally:

* 5W-30 is a good all-around choice for most climates and is likely what the manual recommends. It's a multi-viscosity oil that provides good protection in both hot and cold temperatures.

* 10W-30 might be suitable for warmer climates.

Do not use a weight heavier than 10W-30 without consulting your owner's manual. Using a heavier oil than recommended can hinder engine performance and even cause damage. Always check your owner's manual for the manufacturer's specific recommendations. The manual will specify the weight and type of oil (conventional, synthetic blend, or full synthetic).