The problem with seafoam is it will phase separate. You noticed an issue after it sat up. What I recommend is "stirring the tank" when it is going to sit up. How ever you want to do that is up to you. I am lucky enough that my stuff does not sit long so I only have to use a FI cleaner as a cleaner not as a fuel stabilizer. What I do recommend since it does not separate when mixed properly is BG Products. I use it in every vehicle I own. The local rep has proven to me it does not phase separate and sea foam will. We mixed both per recommendation in my shop in glass jars and I set them on my counter and did not touch them for 2 months. The sea foam started to separate within a day (hours actually) and the BG did not over 2 months. Sea foam is a GREAT product and I have used it. I am not slamming it. I am just giving my experience.I put one ounce per gallon in my VS650 when I know it will not be ridden for a month or more, usually this is only during the winter.
I also use it like carb/injector clearer on any motor vehicle or the lawn mower when they seem to be not running right. Since it has a shelf life of about one year, and the Vstar only needs 4 ounces out of the 16 ounce bottle, it gets used up in one vehicle or the other within a year.
I get the sense my bike in the spring seems a bit off on that tank of gas with the seafoam from last december. It does keep the gas from degrading, but Im not sure if it also throws the engine or ECM off just a bit when you use it. Even with a fuel stabilizer old gas is still old gas.
I have also put it in the crankcase about 500 miles before an oil change a few times, once on my Vstar, and once in a car that burns a lot of oil. Dont know if that accomplished anything.
I have never heard of seafoam harming anything.
Ah. Gotcha. Ride on!
Make sure to use any fuel cleaner, stabalizer, whatever according to directions. Too little and it does not do much. Too much and you can actually poison your gas. If you pull out your plug(s) and they have an orange tint you have too much additive in your fuel.I throw a couple oz's every fill up. I did notice improved performance in my carburated bike, I suppose with FI, the ECU adjusts for it.
FWIW...I used to have to put in seafoam or other injector/carb cleaning additives once a month to keep my FZ1 running well (Carburated).
Then a guy at work suggested I try higher quality gas from Chevron instead of using Costco.
After 2 tanks (I commute and generally fill up twice a week) I no longer had cold start or idle issues. Now I only fill up at Chevron, Shell or 76, I don't trust Costco or Arco or any of the other cheap options.
I am now a firm believer in higher quality gas for all my vehicles. It has been 2 years since I swapped to Chevron and have not needed to use a injector/carb cleaning additive in that time frame.
I have heard similar stories before. I wish it was easier to find non-ethanol here in California, but it is not.FWIW...
My youngest uncle - he's only 12 years older than me - spent his entire career as a petrochemical engineer. Worked 40-some years in refineries in Texas for Amoco, Texaco, Shell, Arco (AKA BP) and Valero. For the last 20 years or so he's been the 'head dude' in charge of gas quality & blending for Shell, though he's retiring imminently.
What he said, consistently, is that it's all about the same for 87 and 89 octane stuff. The only real difference is in the 'premium' 91+ levels where the additives really are different and the care taken is also different. THERE you will see a difference between name-brand and generic gas. FWIW, he'd also tell you to buy non-ethanol if at all possible, and that IF you want to buy premium gas, Texaco is the best blend and Shell a close 2nd. He once explained to me what "techron" is, but lost me about 30 seconds in... something about 'covalent polymerized' something or other... He never worked for Chevron but seemed to feel they were top quality. He did not have much respect for ARCO/BP quality: best I ever got out of him there was between the Brits being cheap and the Californians obsessing over meeting emissions, they never did do it just right.
Places like Costco, Giant, Turkey Hill, Sheetz, etc. that don't own their own refineries are buying from the big boys anyway... You may be getting amoco one week, shell the next, valero the following, getty the next, or a blend of them through a middle-man distributor. Certainly you're getting a 'blend' of them in the station's tanks quite often. But note that the big boys do NOT sell their own premium blend to the distributors/generics, they sell a different 91-93 to them that meets octane, but without as many additives, detergents and such.
He didn't regularly buy premium gas for his everyday cars. He did buy it for the 'toy' cars he kept with high-compression engines that need it. He did recommend running a tank of premium through a regular car 3-4 times a year just for the detergents. I asked if that didn't foul up the 'computer' and he said 'not enough to matter.' Never thought to ask him about Sea-Foam. Maybe I'll ring him up and see what he's got to say.
He did also regularly say buy gas at a high-volume station. To him the key difference was how long the stuff sat in the tanks ESPECIALLY with hydrophilic ethanol involved.