IT is BS that theese engines do not last long. The new generation Os engines is just as good as any italian made engine when it comes to how long it lasts. OS moved their P/S manufactoring t Taiwan and can now use chrom instead of nickel on their sleevs.
My V-spec buggy engine has run 12 liters between 130 nad 140 degrees celsius and is still in great shape!
It is not as fast as the Italian engines but for 300 bucks it is great. I bought one and was going to run Norwegian champs but it rained away. But is was quite fast until the rain came out.