I wasn't going to weigh in until I saw what tractor vet wrote. Why do you need 95 octane fuel for an engine in the 7:1 compression ratio area? Thats wasting money. If you find an engine that runs better on premium than regular that it was designed for, there is a problem. Usually its carbon buildup causing increased compression or hot spots. Both cause pre ignition (pinging or spark knock). What are you going to do when 95 octane isn't enough? Using octane above whats recommended is only treating the symptom and not the cause. Premium does not "burn slower". Octane in simple terms is "flash point". An engine needs only enough octane to not set the fuel charge off by a hot component. A glowing bit of carbon is not as hot a spark, but it will set off a fuel with lower flash point. There's no substitute for routine maintenence. Have your fuel injectors and induction cleaned on a fuel injected vehicle every 30k. The best fix for that Oliver would be remove the head to remove the carbon build up and grind the valves. Fully inspect the intake for cracks/leaks. Verify you have the correct plugs.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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