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what to check when buying a a4?
Ask, Fresh or raw water cooling?
You want fresh, but raw is okay.
if you check this:
As you face the flywheel, on the left side
remove a bolt from the water jacket cover, at least three threads showing on the bolt? This is a gauge of water jacket corrosion. Three is minimum, 5 is good 7 is great.
Remove the spark plugs and check compression 80+ PSI all cylinders at cranking speed with the throttle full open?
The pressure reading should be fairly even on all the cylinders. This will show up stuck/burned valves.
When the engine is spinning with the plugs removed via the starter motor is there at least 10 PSI oil pressure?
This checks the lower end for bearing damage.
On a healthy A4 with 30 wt oil you should see
at least this. Possibly more.
Is the exhaust manifold in good shape? It''s water cooled, if it corrodes through you will get water in the engine.
How''s the oil look? Should have no signs of water having been mixed with. A bad water pump can cause this.