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I top off my tank of 93 octane with about 2 1/2 gallons of E-85 because it is said to be approximately 105 octane. This will not help the valve seats but it allows me to add some extra ignition advance.

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I use Castrol valvemaster plus.
But don't know if you can get it in the states.

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Looks interesting.... not sure if I can get it shipped here...



Castrol Valvemaster

Should you not wish to have your car classic car engine converted to consume lead-free petrol by means of cylinder head conversion etc, then you are highly advised to use a petrol additive. The lead in petrol plays two major roles; firstly it prevents valve recession into the head by means of lubricating action, and secondly provides an octane boost to ensure correct burning and alleviate pre-ignition (reducing pinking). Either of Castrol's products are designed to replacement the lead element missing in unleaded petrol. The Valvemaster Plus also contains an octane booster to boost the octane level of unleaded petrol up to the desired 98 level (equivilent of the old 4 star) for correct running of classic cars. Should you not wish to use the octane booster then we would advise you to either alter the engine timing to account for the lower octane rating of unleaded petrol or use the more expensive super-unleaded.

With obvious concerns about the efficacy of Lead Replacement Petrol (LRP), especially as regards its lack of a British Standard, and the petrol companies' own warnings regarding the unsuitability of their product for "everyday" use, most owners are opting to use Castrol's Valvemaster plus.