Thank you to everyone who's responded so far!
Judging from the responses so far, it seems like it
might help with the leak.
I'm going for the Pennzoil HM 10W-30 because it's 12 cst and has an HT/HS of 3.4. I'm planning on running it for 3 5k mile OCIs. I figure that 15k should be plenty of time for the seal conditioners to do their thing.
The car is leaking just about a quart per 1500 miles.
Thooks, it's leaking from the rear passenger side of the engine. There's a VTEC control solenoid valve (#9 in the picture below) that seems to be the source. If I touch the bottom of the assembly, I get lots of oil. The oil goes from there, down the brake lines, and drips on the cat's heat shield and smells terrible! If anyone can think of anything else in the vicinity of that valve that might be leaking, please let me know. I just don't see anywhere else for it to leak!
I've replaced the seal and filter (#10 in the picture) between the valve assembly and the cylinder head already. It was physically intact, but was cooked and hardened. Its replacement didn't slow the leak at all. I'm going to order the other two small seals that go in it (#12 & #21), and see if they help. I really don't want to buy the whole assembly, because even though it's on sale, it's still $229. I'd have to leak a lot of oil to break even on that!
(had to crop this pretty bad to make it fit, sorry)