Miata Mailing List: February 1999, Message #104

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FYI:

At about 50k, my '94 would start making significant HLA noise at about 2.5k
miles or so after an oil change, synthetic or not, particularly on a hot
start.  I used the Amsoil engine flush treatment, and I haven't had a
problem since - it runs nice and quiet, even at 3k miles after an oil change
(running synthetic) on a hot start.  But I only have about 60k on the motor
now, so I don't know about the longevity of the fix.

Before you replace the engine, you might try flushing the engine first.
YMMV, especially on a higher-mileage engine.

George Hudetz