Just thought I'd throw this out there. My truck is only 2 years old with 18,000 miles and I already had surface rust forming. Everyone should get ahead of this and check their valves.
I used some 600 grain sand paper to work off the rust and applied LPS3. I'll check it again in 4 months or so.
Before:
After:
I used some 600 grain sand paper to work off the rust and applied LPS3. I'll check it again in 4 months or so.
Before:
After: