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My two unmodified Land Rovers were the only vehicles that made it out of my subdivision when the flooding started after Harvey. They were also the first back in two weeks later and gave rides to other residents that needed it.
Since Top Tier gas was mentioned, should you continue to use gas treatment/fuel conditioner annually if you are already using Top Tier gas? I toss a bottle of Techron fuel system cleaner in every few months, but if using premium gas with STP additives does the same thing, I'll invest the money in something else.^^^ This. If you are not sure if your usual brand of fuel is Top Tier, confirm on the official website - here's a link:
https://www.toptiergas.com/licensedbrands/
Extended use of cheap gas can cause all sorts of headaches with the fuel system.
In general it doesn't hurt, but if using Top Tier every tank, you don't need to use additional cleaner very often. A bottle of Red Line SI-1, or can of BG 44K, won't hurt every year or two... but really is not needed every few months. If you do use a full bottle/can, try to do this on the tank just prior to an oil change, as the strong solvents can contaminate the oil a bit. If you want to use something more often, use a couple ounces of Red Line SI-1 per tank.
In general it doesn't hurt, but if using Top Tier every tank, you don't need to use additional cleaner very often. A bottle of Red Line SI-1, or can of BG 44K, won't hurt every year or two... but really is not needed every few months. If you do use a full bottle/can, try to do this on the tank just prior to an oil change, as the strong solvents can contaminate the oil a bit. If you want to use something more often, use a couple ounces of Red Line SI-1 per tank.
I did a lot of research on this years ago and my personal regimen is to use a full bottle right after purchasing a vehicle, as I have no idea what the previous owner(s) have used for fuel or additives. But afterwards, I don't add anything on a regular basis if the engine is running normally. Maybe a bottle of the good stuff every 5 years or so if I remember.
For a really good tech discussion on this, read the first Amazon review for SI-1 by "Slipstreampilot" at this link. This also explains why some additives are more expensive than others, due to the PEA levels. There was a different SI-1 review where someone had monitored MPG data over the long term and found a noticeable, repeatable improvement with the ounce or two per tank... can't find that review at the moment though.
