Any recommendations on what additives to use in unleaded petrol? Is this stuff any good? Many thanks

I've used Wynn's for a few years in my 500, nothing to report.

Then I've used nothing for the last two years, same difference but cheaper.

I used a lead-replacement fluid and all it did was to leave lots of deposits on the valves and cylinder-head. The valve seat problem that followed couldn't have been worse if I had used fine sand as an upper cylinder lubricant.

Oh ok so I can put a tank of fresh unleaded in the 500 and it’ll run ok? So many opposing views hard to know what to do for the best to protect my investment!

ACB said:

Oh ok so I can put a tank of fresh unleaded in the 500 and it’ll run ok? So many opposing views hard to know what to do for the best to protect my investment!

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We've discussed it before; I have a biased point of view because I had specific and unusual valve problems, but I am sure that all 110 and 126-type engines will run OK on unleaded. After high mileages (16,000 in my case) and with hard use, such as mine (5 to 6000 miles a year) there will be valve problems. Some very late 126 engines are more or less suited to unleaded.
I don't think additives really work as a direct replacement for lead; but they may help. The best permanent solution is a modified head.
I you're a sunny day, weekend driver who does the odd longer drive, I wouldn't worry about what you put in the tank.
I have now done 5000 miles on an unmodified, later 650 engine with untreated unleaded and in comparison to many people am sure that I am quite hard on the thing. But so far I have no problems

ACB said:

Oh ok so I can put a tank of fresh unleaded in the 500 and it’ll run ok? So many opposing views hard to know what to do for the best to protect my investment!

Click to expand...

Hi ACB,
For what it's worth I feel the same about my investment and I use Millers VSPe Power Plus - it adds two octane points and protects against ethanol in fuel - see the web site.

Ian.

Ok thanks. My 126 BIS runs on unleaded only. Just trying to do the right thing in the 500 that’s all.

I am putting additive some times, maybe one fill with and one of two without. I think that it doesn't really matters. My opinion my car my pocket...my experience.