The first half (roughly) of 85 had the kh motor in it. The later had the mc, but it was more similar to the kh than the 86 and up mc. 8.3 compression,smaller displacement 2,144cc,etc. I hope somebody will listen to me because i am right on this one. The mc had the watercooled turbo and during ther parts overlap had dual oil filters.....Thanks....Steve 84 5ksT 1.8bar