ever since I bought my rabbit used in 2010, and after replacing my engine, and coolant expansion tank among other things, I have replaced the expansion tank cap seemingly incessantly over the years. perhaps twice a year most years, the caps fail, and I start losing coolant along the sides of the threaded hole in the expansion tank. I have tried just about every brand of expansion tank cap, from the $12 German auto parts ones to the $3 or $4 dollar Napa ones and everything in between. they seem to work fine for a couple months, and then that sweet smell comes trickling back. I can't remember how many caps iv been through, or how many jugs of coolant at that. it drives me mad. if I could just find that one last cap, precisely machined by hand out of gold and silicon, I would be willing to drop $xxx.00 if it meant I could just stop this awful cycle. please help rabbit people, please!