Morris Minor Owners Club

Someone reccomended mr Wynns Substi Plomb! As a.fuel additive in my 1098. He uses it in a Marina. Should work out lot cheaper than E5 now I m doing some mileage.
Is that a particlarly good one one please or what do you recommend.?
Thanks very much. Jonathon

E5 is still a lead free fuel just upto 5% ethanol rather than E10 upto 10% ethanol.
You could consider modifying or exchanging the cylinder head as its the valve seats that are mostly effected by lead free fuel.
Or as you say use a fuel additive to compensate for lead free.

As Bill says, Wynns Substi Plomb is a Lead Substitute so has absolutely diddly-squat to do with Ethanol in fuel.


Ethanol was used as an anti-knock and octane enhancing additive in fuel as early as the 1800s.
It's a long and complicated timeline, see here: https://en.wikipedia.org/wiki/Timeline_of_alcohol_fuel
In the era our cars came from, nobody cared about Ethanol in Fuel...https://youtu.be/4uEqqlqqf4Q
Cleveland Discol was sold from 1928 to 1968.

The problem we have now is modern synthetic rubber and such materials, which don't like the Ethanol.

'Lead' (tetraethyl lead) was added to petrol starting in the 1920s to boost octane ratings and prevent engine knocking.
As a side effect, it was found to lubricate the valves
So when lead was removed, people got their 'knickers in a twist' about their engine valves and a whole lead Substitute industry was born.

Generally speaking, you have to be working your engine hard to damage the valves, so IMHO, it's not worth fitting a 'Lead Free Head' unless it's already worn, do you even know if your cylinder head doesn't have Valve Seat Inserts?