* Engine Variation: Porsche Carrera models from 1991 came with several engine options (3.6L, 3.8L). Each engine has a different oil capacity.
* Specific Model: Even within the same engine size, different variants (Cabriolet, Coupe, etc.) may have slightly different oil capacities.
* Service History: Oil capacities may change slightly depending on whether your engine has had any modifications or if you have a different oil filter than stock.
Here's how to find the correct information:
1. Consult your Owner's Manual: This is the most reliable source of information. If you don't have it, you can often find online versions for your specific model year and variant.
2. Check the Oil Fill Cap: Some cars will have the oil capacity printed on the oil fill cap or the dipstick.
3. Contact a Porsche Dealership: They can look up the correct information based on your car's VIN number.
4. Use a Reputable Online Resource: Websites like Porsche-Code.info can help you identify the correct oil capacity based on your engine type.
Always check the actual information for your specific car before adding oil.