He also said that if an engine had signifcant mileage on it, using leaded fuel,that to change to unleaded for a limited milage per year would be fine as the necessary parts in the cylinder heads would have built up a coating.One man's opinion,but probably the finest engine builder here in the U.K.
"'50 Karmann" wrote:
Q: Will switching from leaded to unleaded fuel/gasoline immediately damage a car engine incompatible with (not fit to run on) unleaded? A: No. Lead is retained in the car's engine long after it has stopped using leaded gasoline, this is called lead memory. Lead memory ranges from between 10,000 to 20,000 km. depending on prevailing driving conditions.