Thread: Oil viscosity mixing?? Help!
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Old 06-28-2010, 09:22 AM
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Cobra Make, Engine: ERA 289 FIA #2100 Rio Red Wimbledon White Stripes 302 stroked to 331 Webers Richmond Road Race 5 speed
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The 10W30 mix with 20w50 was from the Brad Penn web site. My engine builder recommended 15w40 oil.
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