×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Motor Oil - Cold Cranking Cold Pumping

Motor Oil - Cold Cranking Cold Pumping

Motor Oil - Cold Cranking Cold Pumping

(OP)
I am confused. In reviewing the SAE J300 Table, I note that for 10W the maximum viscosity for cold cranking is 7,000 cP measured at -25C and the maximum viscosity for cold pumping is 60,000 cP measured at -30C.

I know that these measurements are done using different test apparatus and procedures, but if the viscosity units are the same (cP), how can an oil at the maximums allowed by the spec have a viscosity of 7,000 cP at -25C and a viscocity of 60,000 cP at -30C?

I understand that most oils would not actually be right at the max for both tests, I just don't understand the large diffence in the maximum numbers when they are measured only 5 degrees apart.

Thanks for any help you could give me.

RE: Motor Oil - Cold Cranking Cold Pumping

the motor bible-which you can purchace on-line contains a wealth of info on viscosities and fossell v/s synthetic lube

RE: Motor Oil - Cold Cranking Cold Pumping

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources