These days, there are only a few big gas refiners that supply everyone so the quality of gas is much more uniform (as well as added ethanol content) ATF is loaded with detergent, so the idea was to boost the existing detergents in your gas tank to clean out deposits and carbon (from using cheapie gas). Contamination can cause weird drivability problems and can be costly to replace.īack then, there were many more smaller gas refiners, the quality of gas would vary (amount of detergent) and cars only had carbs without O2 sensors and cat converters. O2 sensors and cat converters are very sensitive to contamination. ![]() ![]() ![]() L69norm wrote: ↑I believe the practice dates back to the days before fuel injection, o2 sensors and cat converters.
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