5W30 weight.
6 liters
SAE 5W30 any major brand conventional or synthetic oil.
A 2003 Chevy Avalanche typically requires about 6 quarts of engine oil for an oil change when using a standard oil filter. If you're using a larger oil filter, it may need slightly more, around 6.5 quarts. Always check the owner's manual for the most accurate specifications and recommendations for your specific engine type.
5w30
To change the oil pump on a 2003 Chevy Avalanche, start by disconnecting the negative battery cable and draining the engine oil. Remove the oil pan by unbolting it and carefully prying it loose. Next, detach the old oil pump from the engine block, clean the mounting surface, and install the new oil pump with a new gasket. Finally, reattach the oil pan, refill the engine with oil, and reconnect the battery.
For a 2003 Chevy Suburban (all engine sizes), the recommended viscosity is 5W30.
6
2003 Chevy Silverado 2500HD 6.0l 2004 Chevrolet Trailblazer 2002 Chevrolet Avalanche
I don't think they ever came with diesels, so any 5w30 will do well. If it does have a diesel then 15w40.
6 quarts.
Counter clockwise
PF46 if 5.3.