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Temp and weight of oil are factors but that doesn't sound unreasonable at all. The oil has to sneak past the butt ends of each ring so any carbonizing or manufactured difference in rings would make an ignorable difference. This butt gap would vary if the pistons were in cylinders of sightly different dia (a bit more honing on one of them) Rings are actually pushed out against the cylinder by gas pressure behind them so not noticeable in a compression test .Just my opinions Experts may yet join in. other factors include tired injectors, valves for starters.
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