Break in the engine block

Hello together, I drive a VW Crafter which I bought 3 months ago used. Purchased with 126,000 km. Now in 3 months 163.000 I have an engine damage. The vehicle drives in trailer drive and I limited to 90 KM/h factory side. So can not be driven full load. Our problem : We have a crack in the engine block just under the oil filter. Who knows the problem ?? Does this happen more often?? With kind regards Walter Osbeck