Top end clatter / lifter tick?

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Originally Posted by XfireZ51

Throw some Marvel Mystery oil into oil. Let it run through. See if lifter quiets down.

I forgot to mention that I did add about 1/2 quart of MMO to the fresh oil, and let the engine run for about 15 minutes on the most recent start. No change in the sound.

Originally Posted by Dynomite

It appears this engine noise started all at once and you are sure the LT5 did not sound like this only a few days ago?

I've only started the car three times since I took delivery in early January. I do not remember hearing any unusual noises the first time, although I suppose it could have been present but quieter. The second time (about a week ago), it was as bad as it is now.

Originally Posted by efnfast

Dumb question, how much oil did you put in when you changed the oil?

About 7 1/2 quarts, plus a half quart of MMO, plus maybe 1/2 pint in the oil filter, which I pre-filled before installing. I did not drain the oil cooler. I used inexpensive 10W30, as I never planed to have the car on the road before switching to Amsoil 10W30.