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Unread 04-08-2013, 02:07 PM
Spokes Spokes is offline
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Join Date: Apr 2009
Posts: 1,575
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I'm glad you asked that question.

Goldwing=water cooled
CA95=air cooled

The CA95 does require a 20wt for cooler climate, but 20 wt is now hard to find.

Goldwing=hydraulic lifters
CA95=rocker arms riding on the cam lobe

The CA95 as in all old engines requires a zinc compound in the oil. This zinc compound serves as a anti-scuff additive.

No modern automotive oils (except Diesel oil) contain the zinc additive as the zinc additive clogged catalytic converters.

Back to the CA95. Multi Weight oils are "multi weight" because of "polymeric viscosity modifiers" to change viscosity with heat or cold. Old air cooled engines like the CA95 will destroy the polymer chemistry with extreme heat. Once the polymer additive is destroyed the quality of the oil is lost.

Here is some good reading, although the focus is old cars, the article can be helpful for those of us with old air cooled engines

http://www.drivenracingoil.com/dro/new-oil-old-car/
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