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The 2004 Ford Mustang offers three different versions: one has a 3.8L V6 engine, another features a 3.8L V6 engine, and the third comes with a 4.6L V8 engine. The V6 models can hold up to 5 quarts of oil, while the V8 model can hold up to 6 quarts. Ford suggests using 5w20 fully synthetic motor oil from a trusted brand like Motorcraft for all models. To ensure peak performance, follow the oil capacity guidelines outlined in your owner's manual specific to your Mustang trim.
Both the 3.8L V6 and the 3.9L V6 engines in the 2004 Ford Mustang require 5 quarts of oil each, whereas the three variants of the 4.6L V8 engines ([R] Q, [X] R, and [Y] Y) need 6 quarts of oil. They all should be filled with 5W20 synthetic oil.
I am currently in the process of changing the oil and oil filter on a 2004 Ford Mustang with a 3.9L engine. It requires more than 5 quarts of 5w20 oil, specifically 6 quarts to be precise. Make sure to double-check after adding 5 quarts to ensure it's filled properly. This engine hasn't been altered in any manner.
I have a 2004 3.9L engine and found that using 5 quarts of 5w-20 oil was insufficient. I needed to add an extra quart to have the oil level reach the desired mark.