C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Sep 20, 2004 | 05:49 PM
  #21  
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Originally Posted by joe73vette
I get about 5psi more with straight 30W than with 10W30 when the motor is warm. Since I never drive it in the winter, it's all I need. Joe

Same here also.
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Old Sep 20, 2004 | 07:10 PM
  #22  
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Page 53 of the 1975 Owners Manual:



I hope this clears up the confusion.
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Old Sep 21, 2004 | 06:18 AM
  #23  
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Thats a reprint with cheezy info added . SAE 5w-20 oils were not made in 1975 . 20w-20 yes , 5w-20 no .


I use Synergyn 3w-30 ." My " engine builder recommends it
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Old Sep 21, 2004 | 07:39 AM
  #24  
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5w-50
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Old Sep 21, 2004 | 08:25 AM
  #25  
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I just put in Mobil 1 5W-40.

They say it's for hard working trucks and SUV's, but what works harder than a Vette??

Ken
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