If it were my engine that I just put thousands of dollar into, I wouldn't be concerning myself with saving $15 on 5 quarts of oil, I'd be concerned with which oil is going to be best for the job.
So do you think that RP is significantly better than Lucas's Racing Break-in Oil?
Lucas engine break-in oil is designed to protect your engine on its initial startup. It features higher levels of zinc and phosphorous to offer maximum protection. The oil will provide a quicker, more efficient piston ring seal and is compatible with ethanol, methanol, and all high-octane racing fuels. Lucas engine break-in oil is recommended for use on the initial break-in of both flat tappet and solid roller camshaft applications and requires no moly supplement and no additional additives. Less ring blowby equates to more horsepower and a better piston ring seal. Protect your engine's performance and life expectancy with Lucas engine break-in oil.
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Designed for engine builders, Royal Purple's break-in oil is formulated to allow optimal ring seal and protect rotating assembly components such as the camshaft and valvetrain from initial start-up wear. Engine builders using flat-tappet cams have grown increasingly concerned that many modern motor oils do not provide adequate wear protection for new engines, particularly those using flat-tappet cams. Royal Purple has addressed this issue with their new break-in oil. Royal Purple combines highly refined mineral oil, preferred for engine break-in, with advanced additives containing high levels of zinc and phosphorus to optimize protection in flat-tappet and roller engines. Royal Purple break-in oil is fully formulated and does not require the use of any other chemical additives. Royal Purple recommends using one of their high performance motor oils after the engine is broken in for maximum engine performance.
