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"This part of the chapter is not just for newbies; even if you've written e-mail for years, review this section carefully. Certain unspoken conventions are very important to keep in mind when you're composing e-mail messages. If you were a novice before, you need to be a professional now.
ONE OF THE BIGGEST MISTAKES PEOPLE MAKE IS TO TYPE WITH THEIR CAPS LOCK ON. All-caps might look cool to you, but experienced users will write you off as an idiot. It's okay to use all-caps for headings and/or titles in your messages, or even to EMPHASIZE certain words, but anything beyond that is equivalent to screaming at someone. Do you like being yelled at?"
"If you drive your car hard and you are in the city 95% of your time, then you can use either a 5-30 or 10-30 SH or SJ oil. We should use an oil that protects us between the temperature range we live in. Using a 5W-30 or 10W-30 oil will generally give you 1-3% better gas mileage than a 30 weight or 20-50 weight oil. Thinner is better, both for your engine and your pocketbook.
I know that putting a thinner oil in your car goes against everything you have been taught. Most of us cringe at the thought of putting a 5W-30 in our engine. First, you must understand what motor oil is supposed to do.
1. Oil is used to provide lubrication between two moving parts to reduce wear. Most internal engine tolerances are measured in thousands of an inch and many tolerances are no thicker than a human hair. So, if you wanted to fill an opening with oil that was no thicker than a human hair, which would do a better job, peanut butter or sewing machine oil?
2. Oil is used to gather or absorb heat from the internal engine parts and carry it away. Let's say two pieces of metal are rubbing against one another at say...50 times a second or 60 MPH. If we want to flush this joint with oil and keep a continuous stream of oil running through and over it to gather the heat generated and carry it away, would you use peanut butter or sewing machine oil?
3. Oil is also used to flush the metal particles from the bearings of your engine. This one should be easy...peanut butter or sewing machine oil?
4. 90-95% of all mechanical engine wear occurs in the first 10 seconds of a cold engine start up. That initial cold start wear can equal hundreds of miles of warm engine wear.
So.... you it's your choice, peanut butter or sewing machine oil?
There are situations that call for a thicker oil. In the event your car consumes an abnormal amount of oil between oil changes, using a thicker oil would be beneficial to you. A thicker oil would, in this case, help you control the oil consumption. An abnormal amount is generally described as more than 1 quart every 1000 miles or so.
But keep in mind that every car made in 1993 and newer recommends a 5W-30 or a 10W-30. We must work to overcome the idea that thicker is better unless of course there is a reason.
I hope by now you are convinced that peanut butter type oils no longer belong inside your engine. We now know thinner is better."
I live in St. Louis, not Phoenix, so I can't vouch for his shop. I do know he seems quite knowledgeable on his radio show.
Again, this is not to state that I believe that 5W20 is anything other than an attempt to squeeze .1 mpg at the expense of 50,000 of engine life. There's a big difference between 10W40 and 5W20.
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