These
vehicle inspections also reveal how well a vehicle's maintenance history has
been kept. This may be the most over looked part. A competent technician will
look for oil and sludge varnish build up on the engine's dip stick and sludge
formation on the oil filler cap both are indicators of oil change intervals
well beyond the 3,000 mile mark. Quick inspection of the radiator coolant level
and over-flow bottle can reveal contamination erosion and acidic build up
around radiator neck and core. If revealed during inspection this can mean a
cooling system nightmare, such things as internal coolant loss possibly due to
electrolysis eating away metal internally on vital engine components like
cylinder heads, engine block surfaces water pumps etc...Very similar to rust
erosion seen on eastern vehicles were salt is used on the roadways in the
winter months.