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In full F3 specification, the engine life is somewhere between 2500 and 5000 miles between rebuilds. Engines come from VW, Mercedes, Mugen Honda (Neil Brown), Opel Spiess, Toyota etc., You can easily eat up your engine mileage testing.
Some are prepared to sell parts for a rebuild, in which case you could do it yourself if you were prepared to do it. Others are not and will only work on the engine and want to break their seals themselves. This can be expensive, but the turnaround is quick and all you have to do is bolt it back in.
Remember if you get it wrong, the bills can be very big, but you have to have high standards of workmanship, finish and cleanliness as well as fastidious attention to detail.
Genuine Dallara parts can be expensive, but there is usually a selection of secondhand serviceable parts, or copied parts.
From 1999 the high cockpit sides were introduced with neck padding which allow more cockpit room for taller, broad shouldered drivers.
If you are uncomfortable about engine rebuilds, consider Monoposto - the same tub/chassis but with a road car derived engine. Secondhand engines - eg Toyota / Vauxhall - a hundred quid from a scrap yard and a DIY engine rebuild.
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