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Discussion Starter #1
I always use Pennzoil 20W-50 which I need to special order as no one in the area sells it.

STP though is available at the local auto parts store in this weight.

Same things basically?

Thanks
 

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I have used Castrol 20-50 for many years in many different air cooled machines, always works. Generally 10-40 is recommended for water cooled.
 

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Discussion Starter #3
Anyone with direct experience with STP oil?

Not looking for a recommendation on weight or other brands.

Thanks
 
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