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Car use to be a street car ran m1 5/30 and GC 0w30. Car is now full time drag car with a LT1 Stock. How often should i be changeing the oil?Any tips on the grade i should be running or just keep what i have been putting in there? .Also so getting ready to put a new rear end in with a spool what...

Just note that car has 127000 miles on it.Wife put down the wrong mileage off of other car. Only oils this car has ever run is M1 5W30 and the Castrol SYN 0W30.Interesting is last change i found that only 3 quarts were the gold and 2 were the green AZ changed up on me .This is my first time on a...