According to the 2002 Mercury Grand Marquis Owner Guide :
With engine oil filter change :
The 4.6 liter V8 engine takes ( 5.0 U.S. quarts of 5W-20 )
According to the 2001 Mercury Grand Marquis Owner Guide ( 5W-20 ) ( with engine oil filter change , 5.0 U.S. quarts / 4.7 litres of 5W-20 engine oil )
Should be 5W-20, which is typical for Ford products with a gasoline engine.
Use API Certified SAE 5W-20 Engine Oil
In a 1995 Mercury Cougar , 4.6 liter V8 engine ( 5W-30 ) * according to the Owner Guide
Does any body know four adjectives im in 8th grade and have to do a biopoem but dont know anything about Marquis de Lafayette
5w 30
5w20
No dummy Pluto is and im in 6th grade!
if your studing in grade 6 I know the answer it's mercury
What grade of oil is best in your 5.3 liter Chevy engine?"
According to the 2000 Mercury Mystique Owner Guide ( 5W-30 )
What is the engine? Year? If 2.3 L and the engine knocks due to low grade fuel 87 or 89 octane, then just back off the timing. Hope this helps. This engine should run on 87 octane with no problem. If not check the advance, and pick up in the dist.