Hey STS, How's the trailer? Yes, no doubt the IP will leak. However, the "tonic" of auto trans fluid plus 2 stroke oil I used to solve my 86's IP leak hopefully will work for the 90? I'm not really planning on driving this car - it's not registered nor insured at this time. Don't know how long to expect the D2 to stay okay. Guess I'm taking a chance not running it all out and putting in fresh ULSD? Thanks for the response. Paul