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I contacted Blackstone. They recommend the refrigerator tubing, but suggest I wait an hour or so till the engine cools a bit.

The Blackstone site says use "refrigerator tubing"

My service manager called and offered me an 8 year/125K mile platinum warranty. Of course I accepted, but I will continue to pursue the source of the clatter.

yep...that's it

Mine is actually a vaccuum and brake bleeding kit. The hard milky white tubing sounds exactly like what I purchased at Lowe's

i actually have a MightyVac pump. The tubing that was provided is very soft and plyable. The refrigerator hose I was referring to is much harder.

I aready have a vaccuum pump, so I just need the tubing that fits down the dipstick tube. Can I use the plastic tubing sold in home and hardware stores for ice-maker hookups, etc.? I'm afraid it will melt in the hot dipstick tube.

My service manager just confirmed that they used PRIMEPLUS as their TGMO. Say what???

I just got an email from my Service Manager. Their version of Toyota Genuine Motor Oil is PRIMEPLUS. I never heard of it and I'll never find out if its high moly or not.

Its Bill... and yes... I think I'm screwed.

That's funny. I have the sound when its cold. They said its because the forged pistons must expand to fit tightly in the cylinder at normal operating temp.

I have cold startup noise in 2008 Sienna. Some call it say piston slap, but Toyota will never utter those words. Is there an oil out there that can help quiet down the noise and reduce wear?

I may have found the source of the high moly readings in my used oil sample. I found online that the Lexus 3.5L 2GR-FSE uses moly-coated piston skirts to reduce friction. Since the Toyota 2GR-FE is a close cousin of that engine, I assume it also uses moly-coated pistons. If piston slap is the...

The reason I ask.... the polyethylene tubing at Lowe's has a max operating temp of 120 F.

Did anyone ever have a problem with that plastic tube melting in the dipstick tube??

I definitely want to take my own sample next time. Do you recommend taking from the drain plug or sucking out the dipstick tube?

I've owned a number of cars with timing chains, but never had one as noisy as the 3.5L.

I've read that the 3.5 is much louder than the 3.3, and prone to piston slap too

Toyota wouldn't even check that TSB because the sound goes away when the engine is warm. And I can't imagine that metal to metal contact doesn't result in some wear material in a UOA.

Something don't make sense.... My UOA shows 160 ppm moly, but Castrol moly levels are supposed to be <1 ppm.