is EGR valve cleaning required

My 2 cents: every 50k miles is optimum. By then the cooler's got a decent carbon coating, which insulates and reduces it's cooling efficacy, and the differential clogging of the small egr passages in the intake manifold is coming along, with the passage at cylinder one in the lead. If it was my car that's what I'd do. If that's not in the cards, I wouldn't leave it any later than 100K.

 

When I cleaned mine at 92k miles, is was certainly building up significantly, but was still far from serious. Others seem to have built up at different rates.

I'd like to hear from those who have cleaned it more than once, how fast it built up after the first cleaning. Does it build up at a steady rate, or does it go ever faster as the engine ages?

Though my solution to any second cleaning is preferably to not keep it long enough to need another cleaning session. If everything works out perfectly, it will morph from a 125k mile non-plug-in, to a shiny new plug-in, by next weekend. Hopefully, mentioning it now won't jinx the process.

 

better safe than sorry

 

I'd bet that that depends heavily on how much oil consumption increases with age, assuming other factors like driving habits are reasonably constant.
I cleaned out my manifold EGR passages once, and will do it again before doubling the mileages it had then, although oil consumption hasn't worsened much---so far.

 

Done. This afternoon, my 2012 Prius just completed its metamorphosis into a 2024 RAV4 Prime plug-in hybrid.

The choices for the member profile Vehicle: field aren't adequate to describe this, so now is marked as just Other Hybrid.

Two years ago, I added an L2 charging circuit in the garage to use its 6.6kW charge rate capacity, now need to go find a good EVSE to plug into that outlet. Until then, it will be using just L1 charging.