Fuel additive XK

Thank you, Roger, but this is absolutely of no use with regard to my question.

I know of no product to negate the ethanol content in gasoline.

I’ve been using Castrol Valvemaster for a while, but I cannot say what would have happened of I had not. It’s primarily a lead-replacent additive but they have added E10 battling additives.

Water. &10

It is my understanding that in 2022 federal legislation was passed that requires ethanol addition to all consumer gasoline. (In Canada). It was apparently not well publicized at the time as few people are aware of it.

Thanks for all the responses…I guess… I now know less than when I first asked the question. I don’t see Valvemaster here in the US.


In case you park your xk for a long time: try not to use ethanol as it can decant water. Otherwise its completely fine.

I would not open a thread on brake fluids and lubricants: sous peine de morte.


Makes sense, and yes, I quite understand…

i did take the time to re-read your question, the simple answer is> the people who actually use ethanol (including myself) - majority do not use any additives & haven’t had any obvious “major or minor” problems with Ethanol blends, the comments from posters who are strongly opposed to ethanol blends - haven’t even tested in their own vehicles but pose a sense of ‘knowing all without physical experience’…i will mention this again> it was common during early 40’s into the 60’s for public owners & military to add methylated spirits into the fuel tank to combat moisture…
…the bottom line…this applies to everyone who owns any aged car/s - it’s your car & you can add - subtract - modify or leave the way it is of anything you want to, you’re paying the bill, you choose how it’s going to be, just get out there and drive to your hearts content…

TOTALLY agree with that: If stored for long (>1 month) I’d use 100LL.

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Month is fine, entire season is, too, if garaged. Longer is going to be problematic eventually.

check the humidity in your garage.


if the tank is sealed normally (not perfect, but no airflow) the way water gets in is by the fuel expanding and contracting. every time it cools it eventually sucks in damp fresh air. relative humidity rises as it cools down. it gets colder and colder in the tank and below the dew point the water will condense and run to the bottom of the tank from where it will never evaporate again. it can only dissolve into the fuel or collect. this is why i wrote garage, the temperature in a garage is less inconsistent, less and less aggressive heat and cold cycles, less water collects in the tank.

two ways to get the water out… drain, or dissolve… in ethanol :new_moon_with_face: