Gents,

It appears my valve lifters are magically de-priming with time since I oil changed her last month.

If I leave her overnight and startup from cold in a morning, I've got a single or a pair of lifters ticking at startup. The ticking stops at the same point on the temperature guage every day, though sometimes will cut out immediately after startup etc.

If I leave her for a few days in freezing conditions then start her up, most of the right bank's lifters clatter quite noisily, then quiet one by one in a front to back order...

She was oil changed with Mobil S or the like 10W-40 and almost immediately started getting noisy.

The PO had the oil pump bolts done (going on 2 years ago) etc, so I'm wondering if this is oil or pump related.

Quite tempted to drop some 15w40 in and see what happens.

Thoughts?