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I agree with Wally on that one.1000km of racing is like 10,000+km of daily driving.The wear on the bearings,rings,etc. at high rpm and high loads for long periods of time has an effect on every engine,no matter if it´s water cooled or not.Another thing to consider is modern engines are primarily made to keep emissions,fuel economy and production costs at a minimum.In the 70´s german manufacturers used casting and forging processes that are unaffordable by todays standards,that´s one reason why the type 4 case and bottom end is so strong.As long as the temps stay "in the green",there´s no reason why Wally´s type 4 shouldn´t go the same distance as a Subaru with the same horsepower.The materials are not as different as you think,actually most modern engines use inferior metals and/or metalurgical processes to keep production costs down.
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