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Here is my take: The first number, 0-5-10, is for cold starts. Cold is relative as it means the car has sat a while. Thus it does not matter if you are in Arizona in the summer or Alaska in Winter it is still a cold start. What actually happens is at startup, a 0 first number, the oil flows...

Direct from SOPUS tech support: Quote The answer to your first question is that Pennzoil Platinum is one of the leading Synthetic oil in the market. At this time we are waiting for the data from the comparisons to other Synthetic oils. Next, most engine lubricating oils today are made from...

Robenstein, thank you for your comment. Yes, air cooled engines I could understand thicker oil, but not in a water cooled engine. Air cooled engine temperature fluctuates all over the range. Water cooled should not vary 10-15 degrees of the thermostat. If it does something else is in error...

I never understood why folks say use heavier weight oil in hot weather; does not make a lick of sense. Besides lubricating, engine oil is to cool the engine. Oil flowing faster, the more it cools; a thermal dynamics thingy-bob. Heavier weight oil does not flow as well, cannot dissipate heat as...