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post #21 of 39 (permalink) Old 07-02-2005, 04:28 PM
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Yoy are comparing members posting on a net to the factory and the dealer and saying the posters are correct? As has been said, probably doesn't make a rats *&#$ differance.



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post #22 of 39 (permalink) Old 07-06-2005, 11:40 AM
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Just got back from Jiffy lube. Some good news. I've been busy, so I let it go 6,000 miles, although I've checked it. They showed me the old oil and filter and it was just past brand new...hardly dirty at all.

I debated with myself as I drove there. Should I follow the advice of

Hyperion (4 quarts)
TFM (3.9)
DanMan (3.5).

In the end, I instructed the very competent manager to give me 3.7 quarts, and I checked the dipstick and saw that it was just under full.

'04 Silver base; 41,000 miles; mileage when outside temps are cold (low 40s); mileage above 45F (low 50s). June 05: 54mpg; July 05: about 52 mpg..51 mpg thru summer and still about 50 mpg in early November.

Isabelle is the Prius; Richard is the driver
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post #23 of 39 (permalink) Old 07-06-2005, 03:00 PM
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"Way to go Isabelle! " ..........3.9 would have put you right at "full" and 4.0 would have put you 1/16th of an inch "over"



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post #24 of 39 (permalink) Old 07-06-2005, 03:47 PM
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What gets me, if the 1/16 of an inch over the full dot is so bad, why is every Prius being delievered just exactly like that? Things that make you go hmm. Things that make me put in 4 quarts, just like the factory.

It has been said:
Hybrid drivers come in 3 flavors, greenie, techie and cheapie. Pick any 2.
2005 Prius, Millenium Silver Metallic (color code 1C0) over gray, package 5 (AI)
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post #25 of 39 (permalink) Old 07-06-2005, 06:42 PM
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More oil == more oil pressure == engine working harder to pump oil == LOWER MPG.

I have observed this myself.

DanMan has it right. 3.5 is the magic number. Anywhere between the two dots on the dipstick is considered "proper" oil level...above is too full, under is too low.
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post #26 of 39 (permalink) Old 07-06-2005, 07:11 PM
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The engine oil pump has no idea of the quantity available, or cares. Hopefully it just keeps on pumping and pumping.



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post #27 of 39 (permalink) Old 07-06-2005, 07:31 PM
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It sure could make a lot of differance if your car starts consuming oil and you aren't checking every day.
I check it monthly and after 13 times haven't yet had any noticeable change in level. If oil disappeared at a rate that called for daily checking, that would be a symptom of something badly wrong. Why pour too much oil into it in anticipation of such a problem? I mean, golly: this isn't some old broken-down sh!t European or American car that one *expects* to burn oil, it's a Prius!

April 2004 Silver
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post #28 of 39 (permalink) Old 07-06-2005, 07:42 PM
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If I checked daily, I probably wouldn't notice any more than I would monthly, anyway, since the increments would be so small. In fact, a monthly decrease I'd probably notice sooner, unless one morning I went out to find it quarts lower than it was the day before. And then there's a larger underlying problem than whether I'm checking daily or monthly!

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post #29 of 39 (permalink) Old 07-06-2005, 08:03 PM
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My guess as to why the factory overfills is because they expect slightly higher oil consumption during the break in period. My car came seriously overfilled, about half an inch over the top mark. I drew out eight to ten ounces to get it about a sixteenth of an inch below full.
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post #30 of 39 (permalink) Old 07-06-2005, 11:56 PM
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If you checked the oil daily, you would actually be slowly decreasing the oil level in the system each time you checked it (that film of oil on the dipstick that you wipe off each time would eventually add up to a noticable amount)
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