if you remember they had a fan cooling motor all the time shuvit sorry chevette was the worst for itHo Hum!Often when fiddling with Vivas, Victors, Veloxes and Viscounts in those dark and distant days, PEP pistons were fitted to reduce piston, ring, and bore blowby,.... to minimise the emulsified condensate caused by the process of combustion which resulted in the whitish pukey deposits forming on colder areas of the motor? Modern oils are much better at helping to keep this in check though?: