The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 3/26 M Car Covers (by State of Nine) | 12/12 Make Amazon Pay Saabnet!
Date: 21 Nov 2001 13:47:00 GMT
From: dsjkallennopsamcom (DSJKALLEN)
Subject: Re: motor oil


A suggestion on weights for your motor oil . . . Viscosity Indexers (VI's) are the additives which allow motor oil to have a wide viscosity range, such as 5W-40 or 10W50. Modern passenger car engines do not need a 40 weight oil for protection during summer driving conditions. Most importantly, a larger amount of VI's are used to create a 5W40 or 10W50 oil. The greater amount of VI used, the greater the potential for sludge and varnish formation in the engine. Essentially, you want to look for an oil with the least "swing" from the low to the high end of the viscosity range. I'm not being very technical here, as I haven't looked at my technical docs for some time. But, for the majority of applications, a 5W30 weight oil (or, even better, a 10W30) works very well, while reducing the contaminents inherent in a wide viscosity range oil. I've used 10W30 in my '85 900 8-valve since April '85 here in central Illinois. The temps reach as low as -22 degrees F in the winter and as high as 100 degress F in the summer. No problems in starting or engine protection . . . after 142K, the engine is still running fine with excellent compression on all cylinders. Do some research on oil company, and related, websites, and you will discover that wide viscosity range oils create more problems for passenger car engines than they solve. Wide viscosity oils are fine for racing engines however. Don

Return to Main Index
StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]