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In regard to the 2016 Toyota Sienna, it is equipped with a timing chain for its operation. It is advisable to replace the coolant every 60,000 miles, while the air filter should be changed every 15,000 to 30,000 miles. Normally, spark plugs should be replaced every 100,000 miles, unless they are copper, in which case they should be changed every 30,000 miles. Issues might arise with the engine such as a loose gasket that requires tightening, a spark plug popping off leading to engine problems, oil leaks that necessitate immediate repairs, excessive oil consumption demanding earlier-than-expected oil changes. One critical issue to watch out for is engine overheating, which could potentially result in fires and the car exploding.
The 2016 Toyota Sienna is equipped with a V6 engine that utilizes a timing chain, rather than a timing belt.
Remember to replace the cabin air filter.