Maybe read through this discussion before making a choice...

http://www.bobistheoilguy.com/motor-oil-101/

 

Yep on the seafoam also. I've been using it since it first hit the internet and only cost $4 a bottle but was hard to find. Now it's everywhere and "on sale" for $12. But it works. Just be careful and use it per instructions.

 

So I've changed out my spark plugs this weekend to a lower temperature (NGK V power equivalent to Champion rc10yc) and guess what, the noise is gone! No tick or knock. Took a spin around the block a few times and got the temp up and romped on it to see if I could induce pinging. No pinging either. Hopefully that was the cure. Ending up keeping the K&N filter and the 10w30