In other words, a timing belt is not made to last forever. In general, a timing belt is usually good for between 40,000 to 100,000 miles before it needs a replacement. Meanwhile, a timing chain (often made of metal) lasts longer, often between 80,000 to 120,000 miles.
Some BMWs in the USA with the N20 engine are covered by an extended warranty for the timing chain problem. In November I received a letter from BMW notifying me that BMW was extending the warranty on my engine's "Timing Chain and Oil Pump Drive Chain" to 7 years/70,000 miles from my original service in date. I have a 2013 X3 2.8i.
In many cases, timing chains stretch due to improper owner maintenance. Going too long between oil changes and using the wrong type or viscosity rated motor oil causes the timing chain pins and plates to wear, resulting in timing chain stretch. Most automakers recommend replacing the timing belt every 60,000 to 105,000 miles. Timing chains are heavier and more complex than timing belts, but they also last much longer. Really, unless there’s a problem, timing chains don’t have a replacement interval.
BMW use timing chains in almost every model of engine that they produce. It is recommended to replace your timing chain before failure as repair prices can become very high from internal engine damage if left. The average life of these timing chains is 90,000 miles or 9 years.
Recently bought a BMW 3 series 318d from car dealer. Car lost power as I was driving (luckily enough I had enough movement to roll over to side). Car is 58 plate done 110,000 miles Car was picked up and took to local garage advised the timing chain had snapped and a new engine re-build will be required in the region of £2,500+. AhU3K.
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    • how long should a bmw timing chain last