The Mazda 6, First and Second Gen, have a timing chain.
Timing CHAIN ( 2.3 liter 4 cylinder and 3.0 liter V6 engines )
All 2002-2008 Mazda 6 petrol engines are chain driven, only diesels have timing belt.
On a 1994 Mazda MX-6 : Both the 2.0 liter four cylinder engine and the 2.5 liter V6 engine have a timing BELT
Both the 4 cylinder and V6 have a chain.
That vehicle with the V-6 or the V-8 doesn't have a timing belt.
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Timing chain, for V-6 and V-8
The 4.0 liter in the 2005 and up Taco's have a timing chain. Great engine.
Timing Belt ( for the 3.0 L - V6 and the 3.3 L - V6 in a 2005 Toyota Camry )
chain ( on the 2.3 liter 4 cylinder and the 3.0 liter V6 )
The 4.0 litre V6 engine in a 2005 Toyota Tacoma has a timing CHAIN