oil question

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  #1  
Old 08-15-02, 09:58 PM
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oil question

93 Buick 3.3, going to change the oil and reading the owners manual and it specifically says DO NOT USE 10-40 anyone ever hear of anything like this and will it hurt to use it. 75,000 miles on the car.
 
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  #2  
Old 08-15-02, 10:10 PM
knuckles
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Last time I checked, 10W40 was the most popular weight of oil sold in the U.S. I have no idea why, since NO manufacturer recommends 10W40 for use in their engines!

It probably won't hurt anything, but it won't help anything either. Why do you feel you car 'needs' 10W40?
 
  #3  
Old 08-16-02, 08:15 AM
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Don't feel I need 10/40 but I only drive in summer and spend 6 months a year in Mexico. I've been using 10/40 for years and never thought much about it and have never had any problems. I was blown away when I read not to use 10/40
 
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Old 08-16-02, 11:47 AM
Dan Meyer
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What grade oil does the manual say to use?
I know that auto mfgr's recommend ligher vis oils ONLY because of CAFE. I have a car that I only drive in the summer. I use 10W-40 because I want that additional boundry lubrication when the heat thins the oil. The manual says to use only 10W-30.
 
  #5  
Old 08-16-02, 12:02 PM
Joe_F
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10W40 is better for some higher mileage engines that tend to burn or leak oil. I use 10W40 in my 84 Olds and 1979 Trans Am (recommended by the OEM on that car), no problems.

No need to use anything but what the OEM recommends unless you do severe service. Even then, still not warranted to use 40.
 
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