My '83 UrQ has 59k miles on it, and it's been run by the previous owner on
Castrol Syntec (great oil, BTW) since it was invented, with no problems. I
just changed over to Mobil 1 15w-50 synthetic, and have logged about 700
miles with no problems. If anything crops up, I'll keep the list posted.
Regards,
Tucker Fritch
'83 UrQ