As with any 25 year old original vehicle, there are going to be issues. I mentioned in the introductory post that the car felt a bit too quick for stock. It turned out that the vacuum line running from the cold side intercooler pipe to the wastegate on the turbo had melted where it crosses the upper radiator hose. The factory boost gauge is not numerically labeled, but the car was definitely boosting "in the red." I suspect 12-14 psi. Upon replacing the wastegate vacuum line, boost was restored to the factory level (around 10 psi), although the car got slower. I ended up replacing quite a few vacuum lines under the hood - 25 year old rubber is just not reliable.
After switching over to Mobil 1 synthetic oil (10-30) the car developed an annoying oil leak. I pulled my hair out trying to source it, as it was dripping off the transmission bellhousing. Of course, rear main seal came to mind at first, but it turned out to be the oil pressure sensor brass fitting on the right side of the block. This fitting was literally hand tight - and seeping tons of oil. Some loctite sealant and proper torquing cured that. However, I switched the oil back to a heavier 20-50 Castrol GTX non synthetic.
Finally, the original windshield had a pretty nasty leak on the driver's side, as confirmed by a trip through the touchless car wash. The original owner had disclosed this to me, and even knocked the price down in anticipation of repair. Luckily, the owner had been acutely aware of the leak, and kept the car out of the wet weather. A new PPG unit went in, and I opted for the later style (better) windshield that was fitted to 91-93 240s.
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