To find the correct fluid capacities, you need to:
1. Locate your vehicle's owner's manual: This is the most reliable source. It will list the capacities for your specific P30 configuration.
2. Check the sticker(s) under the hood: Often, there are stickers on the underside of the hood or radiator support that list some fluid capacities.
3. Consult a repair manual: A Haynes or Chilton repair manual for a 1987 Chevy P30 will contain detailed specifications, including fluid capacities. Make sure you get the manual that matches your engine and drivetrain.
Without knowing the specifics of your 1987 Chevy P30 (engine size, transmission type, etc.), it's impossible to provide accurate fluid capacity information.