[RJ237]

It does make me think of snake oil. I know fuel additives are often recommended for sticking injectors, but I doubt they are a cure-all.

 

[jsuydam]

Seafoam??? The fuel additive?

SeaFoam also makes a motor treatment product that you add to your oil fill port.

 

[jsuydam]

SeaFoam also makes a motor treatment product that you add to your oil fill port.

Best $7 I ever spent!!

 

[ErikDiSomma]

Don't knock it until you try it. I've cured the WORST taps in the Ferrari engines, including one QP that sounded terminal, just by adding one or two treatments. Sound disappeared for life.

This proves to me that there must me some small oil passage in the top end that is prone to clogging. It's hard to believe because these engines stay squeaky clean but when a solvent permanently solves a persistent noise, there's nothing else it can be.