thanks a lot for the answers. I am looking to get a 300SD
if I can find the right one.

I gather the 617 engine is the 5 cyl in the 81-85 diesel models?

I care more about crusing about 70-80 than take offs. I rarely take off fast even with my 325 HP CUmmins. Just burns too much $$.

So it appears that the 617 is great.
Can you explain ALDA. I dont know exactly what that is.
I will keep all this info when I buy one.

Also, is there any major differences (i.e. features etc.) between the 1981 and the 1985 SD's.
thanks again
jt