Seen results right away. First time using it and now it's always getting used.
Have been using the fuel additive and notice a difference already on start up and idle is smoother .....doing and oil change soon to add the friction oil additive will post on the difference
Using it in 1997 Ford F250 power stroke. Engine runs quieter and starts easer also use fuel additive.
Delivery was fast, start to use it for the first time. So far I have seen an improvement of 1 mpg. Along with the oil treatment. Will do an up date review again in the summer.
one day after i ordered there was a big holiday special and i wish i had got it.