How often to change serpentine belt?

[cmoore1]

I have a 2006 CS. The maintence manual just seems to indicate checking the drive belt. I don't see a schedule for replacing it.

[Loren]

Generally speaking you are checking it every 20-30,000 miles and replacing it when it shows signs of wear.

[JFP in PA]

Generally speaking you are checking it every 20-30,000 miles and replacing it when it shows signs of wear.

Or when you conveniently have it off for some other maintenance or repair. These belts are not that expensive, so replacing them while doing some other DIY project makes sense.

[spooltime]

Unfortunately, on the 955 turbo models, there is a LOT of disassembly required in order to even get at the belt so it's not a small project.

I'm wondering at what mileage it makes sense to replace the tensioner while you're doing the belt. I inspected my belt (has about 86K on it) and it's beginning to develop a few small cracks, so I know a replacement will be solid preventative maintenance in the not too distant future. I'm wondering if a fresh tensioner is warranted while it's all apart. No signs of slippage or anything, but tensioners tend to be wear items and eventually do require replacement. Recommendation or thoughts, anyone?

[bigbuzuki]

I change the tensioner every second belt change. No official requirement, just another preventative measure which serves me well.

[Hilux2400]

It's useful to carry a spare and a photograph of its route around the pulleys.

[jagman1]

I changed mine at about 85K. Did not change the tensioner. I would give every pulley that'll spin a twist and feel the bearings to make sure they're running smooth. I'm on water pump #3.

[rpcc]

The power steering pulley is worth changing if it is the aluminum type. I was changed to plastic. That eliminated all of the belt noise from the motor. I'd replaced the belt tensioner and that was the last pulley I replaced - turns out the pulley was the issue.