I liked the 63s because they had a pcv valve (positive crankcase ventilation, first year I think). When it got plugged up people thought that slant six was burning oil at 1 quart every 400 miles and smoking. Clean the valve and hose with gasoline (physically plugged up) and oil consumption went to 1 quart in 2k or more miles.
Now the car was worth a lot more than $400 and it did not cost more than a few pennies worth of gas to fix the oil consumption.
regards
mech
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View my fuel log 2015 Mirage de 1.2 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)