I would like advice about what to look for, when buying used 1996 Discovery 300Tdi Auto, 330,000 klms. Appears to run ok no black smoke when taking off. No service history except supposed to 1 owner used to tow smallish caravan. Told head been done recently and it looks as though it has been off. Needs windscreen (how much $$) ABS light on, drives ok. ANY ADVICE AT ALL will be helpful. The price is good. Thanks again