Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

80w vs 80w90?

I saw some gear oil on amazon that just said 80w. And it got me thinking why theirs no second number like the usual 80w90. I'm guessing their the same viscosity at cold temperature, but i'm wondering what the viscosity of the 80w is at high or operating tempurature.

There are no answers yet.
Be the first to answer this question.