The only thing with unleaded now is that it affects the ignition coil. Just like the old 4* petrol, when it was switched over to unleaded engines needed extra lubricant added to the fuel so that it would burn out the engine parts, particularly the valves. They don't need harden seats or valves just bung some additive in the full tank of petrol each time and the engine would be fine. Now they have changed it so that there is more ethanol in the petrol which is causing problems with ignition coils, despite manufacturers saying its fine to use in the "newer" cars when in fact its not. I've had my car a year and a bit and I have had to replace 2 ignition coils, both the same end. That can only be from the fuel, there are no error messages nothing.
It is probability you ignition module that are burning up the coil.
I've seen many modules that check OK on the tester , but are bad.
Or have a bad ground in the circuit. Or incorrectly or worn gap in spark plugs.
I would run a ground wire from the engine to the body. And inspect your battery cables too.
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It it true, you can run unleaded fuel with lubricant in an engine built for leaded fuel.
You can use a lead substitute or even ash-less 2 cycle oil .
But all engine that was made for unleaded have hardened seats and valves.
The exotic engines even have filled valves..
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When they first came out with ethanol in fuel....
Lots of problems...Had to rebuild many carburetors, they had those cheap
plastic floats .
The ethanol would just eat them up. Yummy plastic
I would replace them with brass ones .
And put in an extra fuel filter before the carburetor.
So all the junk in the tank doesn't get thru. Because ethanol cleans the gas tank too.
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But we have got away from the topic of cats...Meow..Purr (sorry couldn't help myself)
