When to flush the radiator?

I don't remember seeing this in the manual, so when should I flush the radiator?

 

I forgot to add the service manual does state it is long lasting coolant.

 

10 years, its called super long life for a reason

I usually suggest every 100,000km or 60,000mi as well. Toyota say 160,000km or 100,000miles

Your truck would benefit from a good radiator wash at the car wash, its hard to see but theres tons of dirt and bugs between the rad and condensor so its good rinse the crap out of that.

 

Will do. Thanks Bishop84.

 

If you stay on top of the recommended maintenance, I don't think a radiator flush is required. The SLLC coolant is designed to keep things clean.
My 2006 2.7L requires a coolant change at 100k miles and every 50k after that.