a thicker oil would not hurt like try useing 10w30 and you should use 5 qrts thats what i run in mine and she runs like a champ mines also a 1992 though so hope this helps
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THE 92 grand marquis LS M75 with the 281 romeo v8 u cant mess with that
MODS: dynomax bullit exhaust, custom intake, polished upper plenum, 180T-stat, accel coil packs and platnum plugs

also 2005 crysler sebring sedan walter p crysler edition yea its got the 2.4 pics comin soon
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