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Discussion Starter #1
jimok

Got a "03 silverado 3/4 w/ duromax. At 140,000 miles, is there a downside to changing from Rotella 15-40 to Syntheic?
 

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Rotella hasn't failed you in 140,000 miles, why switch now?
 

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Discussion Starter #3
I'd like to get another 140,000 out of her. Just want to preform any preventitive maintenance that may help with that.
 

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Oh...... Squirrel!
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Switching to synthetic now causes the motor to be desludged and causes oodles of oil restriction problems.
 
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