Easiest way to check for sludge is dropping the oil pan. I've never done it, but from what I've heard plan $150 at a mechanic, you end up with an oil change and (usually) a new oil pan gasket to check.
Really good, consistent oil change records can help alleviate the concern, either Mobil 1 every 5k, or Dino oil every 3k without fail...
Beyond that, if you're in the rust belt like I am (Wisconsin here), I'd check for rust in the most obvious and common places. On the NG900's (94-98), the seam on the front edge of the rear wheel wells was the first body place to rust, second is the weeping holes on the inside of the bottom hatch lip - moves to the corner pretty quicly. Not that it's a deal-breaker on a 11 year old car, but it's what I've found to be the biggest thing causing the car to 'look' old.
priors '95SE, '90SPG
posted by 69.174.5...
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