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hyperion said:
What's pretty high? If it's a 16th of an inch it is probably the same as 80% of the Prius's who have had their oil changed by Toyota. They are all adding 4 qts at the change instead of 3.9. I'm surprised they just don't stick in a 4 qt. dip stick.
You can get the 3.9 if you check the car with the service manager after oil change when he informs you that the small amount doesn't matter and a "gosh" more is better than a "gosh" less. Whether you want to take his word for it or not is up to you.
I'll note that Priustek on the yahoogroups has stated that the Toyota-recommended 3.9 will put you right at the full mark. The suggestion is to use 3.5, and then top up as needed.
 

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hyperion said:
Does it run better with a little less or a little more. Oil in an engine does more than lubricate. It also "cools." Four quarts of oil in any car is darn little. Especially one that uses a filter. I still believe that Toyota service knows what they are doing. Question them about the "overfill" and they will continue to do it to be on the safe side. I still think they should offer us a dipstick that indicates full when four quarts are added.
Overfull is not "on the safe side" according to Toyota. It can give warning lights and shutdowns...

http://www.alldata.com/tsb/Toyota/11035 ... ges/50.gif
or
http://autos.groups.yahoo.com/group/toy ... 050-04.gif
US TSB EG050-04
December 20, 2004. ENGINE OIL SPECIFICATIONS. 2001-2005 Prius. (Incorrect
engine oil viscosity or improper fill level may result in a M.I.L. "ON"
condition (most common Diagnostic Trouble Code P3191 "Engine does not
start"). Use SAE 5W-30 API grade SL "Energy Conserving" oil and use proper
fill quantity.)
 
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