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Profile photo ofV10ViperV10Viper
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I have used 0W-40 on all 3 of my Vipers. Gen III, IV and V  and have never had any issues. I have tracked them,  driven them in 90+ temps and below 40(but rarely)   I changed the oil once a year and put about 1,500 miles/year on the cars.

  • This reply was modified 4 months, 3 weeks ago by Profile photo ofV10ViperV10Viper.