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post #1 of 39 (permalink) Old 06-29-2005, 09:05 PM Thread Starter
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Default Oil Level

I've read threads on overfill and such. I assume the two dots on the dipstick are the low and full mark? Where does it say how much oil to put in the owner's manual? All I found was that it's 1.5L between Low and Full. Cause I just checked mine and it's way over the full mark and was wondering how they can overfill the oil?

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post #2 of 39 (permalink) Old 06-29-2005, 11:47 PM
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I believe it's 3.8 or 3.9 quarts.

So I tell them to only put 3 and a half bottles of Mobile 1 in, and leave me the leftover half quart in the car.

It's never overfilled this way, and every 7th oil change, I'll get it done for just the cost of labor and a filter.
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post #3 of 39 (permalink) Old 06-30-2005, 08:42 AM
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Page 312:

ENGINE LUBRICATION
Oil capacity (drain and refill), L (qt., lmp.
qt.):
With filter 3.7 (3.9, 3.3)
Without filter 3.4 (3.6, 3.0)
“Toyota Genuine Motor Oil” is used in your
Toyota vehicle. Use Toyota approved “Toyota
Genuine Motor Oil” or equivalent to satisfy the
following grade and viscosity.
Oil grade:
API grade SL “Energy–Conserving” or
ILSAC multigrade engine oil.

However, experience by all says 3.5 quarts max.
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post #4 of 39 (permalink) Old 06-30-2005, 11:25 AM
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Probably 100,000 Prius are running around sucessfully with four qts. of oil in them indicating about a 1/16 in. high on the dipstick. This seems the way they come from the factory and is what a Toyota dealer will service them with when the filter is also changed unless you make a "big stink".
The next question to be asked is will this practise do any harm? I guess you have to accede to the knowledge of the guy that is warranting the car. Which is the safer side? Oil in an internal combustion engine does more than lubricate the engine. It helps with the cooling. More passing through it is better than less. I believe my dealer is correct and he would charge me just as much for 3.9 qt.s as he now does for four.
One tenth of a qt is less than two "shot glasses." For cooling purposes, two shot glasses high does much more good than running almost a half of qt. low.
No car manufacturer would build a car without a huge safety factor built in.



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post #5 of 39 (permalink) Old 06-30-2005, 03:44 PM
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Hyperion is correct in all aspects. I've read tens of posts (not quite hundres, but give it a few months) and there is this continuing debate about that .10 of a quart.

And just to bolster his comments, I've read hyper-cautious responses about overfill from a number of Prius posters saying that any level of overfill is bad, and that just isn't true. I like to put it this way. If a dealer or oil change shop put in 5 quarts of oil, that would be genuine overfill. 4.5 quarts of oil would also be a pretty serious overfill. However, it takes 10 .10s of a quart to make a full quart. So, an "overfill" of .10 is nothing. If there is not enough clearance accross the entire volume of the oil sump (heigth, width and depth) to take on an extra .10 quart of oil, then Toyota has not taken real world usage patterns into account when engineering this product. I'm pretty convinced they have taken into account these factors as I am running a full 4 quarts of Mobil1 in my Prius and height above the top dot on the dipstick is nothing.

Let's also consider this. Some manufactuers are moving toward dry sump oil systems, where the oil system sucks all the oil out of the sump and keeps it in continual ciruclation at all times. In those applications you would absolutly not ever underfill your engine. So, if that is the coming trend in engine design, why would we do it today on conventional sump engines.

It just doesn't make a whole lot of sense to me to worry about .10 of a quart.

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Hybrid drivers come in 3 flavors, greenie, techie and cheapie. Pick any 2.
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post #6 of 39 (permalink) Old 06-30-2005, 09:00 PM
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Remember... It's 3.8 quarts in the front tires and 3.6 in the rear. Less will reduce your mpg.

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post #7 of 39 (permalink) Old 06-30-2005, 09:35 PM
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Except in Aussieland, where you have to put 3.6 in the front, and 3.8 in the rear. And make them Imperial Quarts.

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post #8 of 39 (permalink) Old 06-30-2005, 10:05 PM
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And that would be an excellent way to end this thread!
How about we knock off the running out of gas thread at the same time. I don't expect anyone to really admit to doing something this stupid on the internet!



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post #9 of 39 (permalink) Old 07-01-2005, 07:59 AM
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Quote:
Originally Posted by hyperion
And that would be an excellent way to end this thread!
How about we knock off the running out of gas thread at the same time. I don't expect anyone to really admit to doing something this stupid on the internet!


Only if we stop complaining about the lack of instrumentation as well!

Never mind ... we would miss that too much!

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post #10 of 39 (permalink) Old 07-01-2005, 08:35 AM
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Good morning Hep. Every site needs at least one "devil's advocate" Every once in a while someone frosts a white cake with chocolate and sells it for a "chocolate cake" ( I wonder where that came from!)



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