You don't simply go by mileage to determine when a timing chain needs to be replaced. You need to pull the valve covers and measure it for stretch and then if it is out of spec you replace it. I know of at least one other member on here who has over 200K on his 119 engine and the chain is still within spec.

I'm not sure if replacement of the chain guides on the 119 is as critical as it is on the 117 engines. If I recall, the 119 has a ratcheting chain tensioner as opposed an oil pressure tensioner on the 117. Therefore, you don't have to worry about the chain slapping against the chain guides on start up with the 119.