5W40 - only available as a synthetic?

  • Thread starter Thread starter swingman
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swingman

Is 5W40 a synthetic only viscosity, or is it available in a more affordable "dino" blend?
 
swingman said:
Is 5W40 a synthetic only viscosity, or is it available in a more affordable "dino" blend?
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Seems I used to buy Castrol in that variety. I lived in Phoenix, and
had an '83 Datsun Turbo ZX. High heat, and the way the turbo was lubed,
made me want the MAXIMUM protection. Was advised by the Nissan dealer
that synth lubes were OK for the turbo, BUT if car was a bit older, it
might develop leaks.
 
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