Question about 1998 Pontiac Grand Am
Posted by Anonymous on
Typically one does not replace all the lifters except during major engine overhaul and when Camshaft and Camshaft bearing is being replaced as well. It is much more common that noisy valve train is misdiagnosed and is really a sign of other problems. Noisy valves and upper end can be a sign of lowered oil pressure. As engines age and main bearing wears, oil pressure will naturally decline with time. However if excessive wear occurs, or if dirt / foreign object has clogged vital oil gallery supply, wear can accumulate much more rapidly.
In short...less oil pressure means more wear...more wear means less oil pressure...
I would first get an idea of the overall condition of the engine. A dirty engine/lifters can first be treated by draining one quart of oil and replace with a quart of transmission fluid and run it for a day or two. The detergents can loosen and clean oil gallerys and lifters. Then drain, change filter, and fill with 10W-40 (4.5 quarts). Otherwise main bearing/oil pump renew or engine overhaul might be in order.
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Posted on Jan 02, 2017
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