I used the A7 yesterday, after fitting a re-con speedo, I thought just to test it out, I did 33miles but the trip cock read 29miles. Anyway, when I arrived home I had an oil leak from, I thought the rocker box, I thought surely my solid copper gaskets have not let me down, so I stripped the rocker box off, all looked fine, so refitted then I noticed that the oil feed union to to rockers, which had the fibre washer on it had been leaking, so I went to all the trouble of stripping down the box for nothing, not to worry, at least it gave me satisfaction knowing that it was not my gaskets, so I was very pleased with the end result.
All the best TTJohn