Q: Low oil pressure noise some noise front of the engine 2001 Mercury Grand Marquis

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Could it be replace timing chain cheaper replace motor with that many miles?

My car has 200000 miles.
My car has an automatic transmission.

Hello - yes, low oil pressure and high miles can certainly product a metallic clattering from the timing chain set, as well as knocking noises from worn connecting rod bearings and crankshaft main bearings. If you are getting low oil pressure warning (light or gauge), the engine is most likely used up, and a replacement is in order. For further assessment, I recommend an engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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