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Question about changing the oil

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Old Sep 12, 2016 | 03:12 PM
  #16  
kruc's Avatar
kruc
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Joined: May 2016
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From: San Antonio, TX
Originally Posted by Stewart_H
I have never gone by the manual. Right or wrong, all I've ever done, ever since I could reach the dipstick when I was a wee lad and my dad taught me how to check the oil, was go by the level shown on the dipstick.

Stewart
Pretty much the same here. The listed capacity in the manual just gives me an idea of how much to buy, but the final "topping off" is done to the dipstick.


(And really, for the shear size and capacity of these trucks, is being "off" half a quart really going to make any lick of a difference? No, not really.)
 
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Old Sep 12, 2016 | 03:35 PM
  #17  
05MilMachine's Avatar
05MilMachine
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Joined: Mar 2011
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From: North Texas
The extra oil shouldn't hurt unless you are foaming it with your crank. The dipstick is a gauge, if it were a 1 inch diameter solid rod going straight down, and everyone's driveways were perfectly level, engine mounts all the same, and tires and suspension all the same, it would be more accurate, but it's a floppy piece of metal going around a corner in a super thin tube combined with all of the other variables, so there is room for error to occur. The capacity of the crankcase is set by the casting of the block, height of the oil pickup, size of the oil filter, and size of the oil pan combined with how much oil level drops while circulating. We don't check while running, so that is out. All these things are fixed and not easily changed except the filter size and the dipstick. The difference in a half quart on a dipstick wouldn't take much error to have really. Are you guys that overfill running bigger filters than the fl820s?
 
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