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Use 5W-20 Oil. For a 2.3L I4 Engine it takes 4.5 Quarts; and for a 3.0L V6 Engine it takes 6 Quarts. (These numbers include oil filter Qty and are out of the manual)
If it is a diesel it is 14 litres ,Ford partsmen for 20 some years
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts / 5.7 litres of 5W-20 engine oil )
The proper oil type is important to keep a vehicle running correctly. 5w-20 oil is the oil that a 1996 Mazda b2300 uses.
5w-20
5W-20
20-50w non synthetic
According to the 2006 Mercury Milan Owner Guide : For the 3.0 litre " Duratec " V6 engine : With engine oil filter change : ( 6.0 US. quarts / 5.7 litres of 5W-20 )
5W-20 is recommended
SAE 5W-20 is recommended for a 2005 Mazda3.
I have found the best directions ever for changing oil in both Mazda 3 2.0 and 2.3 models. Follow directions on this site (http://mazda3revolution.com/how-to-guides/how-to-change-oil-mazda-3-23-20/).
20 gallons