zinc oil additive

“Good product on the doorstep”

“Works great with synthetic engine oils”

“well worth the time and money”

“my engine is quieter”

“A five percent increase in fuel mileage”

“My motor runs very smooth now brainer”

“easy to use”

“now it is smooth and quite”

“efficiency”

“Works better than expected”

“with minor ticking noises”

“leaked in box”

“Using thinner oil in my opinion will cause a lot of problems”

“Poor manufacturing process”

“it appears directions are ignored”

“The product seems to be helping got a little more compression out of my engine not happy with how Amazon delivered the package by fiscally throwing the package like a frisbee across my property onto my porch unacceptable”

“Probably too heavy a weight despite a hot running turbo motor”

“expected gas milage increase”

“It also turns the oil a very dark black making it look bad”

“I'm not cool enough to have the equipment to measure if it's working or not”