Last week my husband was driving my 08 Sienna and it started making a knocking sound in the engine. We took it into the shop and found that the vvti hose had failed and drained the oil tank. The mechanic found out about the recall and we had the van towed to the local dealer. The dealer replaced the valve and sent us on our way. When I asked about possible engine damage they assured me they was none. My question is, how can we be sure? The dealer assured me that they checked the engine, but could not tell me what they did to ensure there was no damage. From what I have read, the engine only clicks when it has no oil - and it had been clicking for about 10 miles before we got it to the mechanic. With no oil for 10 miles, would there be engine damage that we should watch out for?