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post #11 of 91 (permalink) Old 10-12-2005, 04:02 PM
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ok guys. after break in or somewhere around 1000miles just for safety , start using mobil 1 and then FAGETABOUT IT! change every 5000 miles ( just started doing that after 40 yrs of 3000 mile intervals)dont worry just just do it .

fred from nashville and smiley(04 black prius)
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post #12 of 91 (permalink) Old 10-12-2005, 04:04 PM
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ps for my main man dan. i agree that nowadays any ole oil is very good but for me mobil 1 thats the ticket.

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post #13 of 91 (permalink) Old 10-12-2005, 04:14 PM
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I also use Mobil one in all my cars but you got to know when the car gets high milage Mobil one is the best leak finder available. It will find any worn seal or weak gasket that will not leak with normal oil installed.
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post #14 of 91 (permalink) Old 10-12-2005, 05:59 PM
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very good response hyperion. i have to say tho that unless its a collector car "out of warranty out of here!"

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post #15 of 91 (permalink) Old 10-13-2005, 09:58 AM
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Quote:
Originally Posted by hyperion
Nope, I only know that in the higher performance engines before you get to the oil coolers you increase the size of the oil pans for more oil thus more cooling. When you can keep it out of the overhead valves more is best for cooling. 3.5 and even 3.9 is pushing the envelope. It is so unimportant that's probably why the cars are all initially serviced with four quarts. My Jags all had 14 quart sumps in lieu of an oil cooler.
Well, this isn't a performance engine, and it doesn't need a big oil pan. if the oil level were that critical, the add and full marks would be much closer together. As I see it, the two marks are at least a quart apart.
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post #16 of 91 (permalink) Old 10-13-2005, 10:25 AM
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Does anyone have any actual data on MPG vs. oil level?

Is there an oil pressure difference when the engine has 3.5 quarts vs 3.9 quarts? Is 3.9 quarts truly considered overfilling?

If more oil means more cooling, could an increase in MPG with less oil be a result of *less* cooling and therefore less ICE running just to maintain operating temperature? I would expect a measurable reduction in warmup time (although probably very slight) given less oil to heat up.
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post #17 of 91 (permalink) Old 10-13-2005, 03:00 PM
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I do not subscribe to the claim that more oil means cooler oil. Of course at the extremes this is true, but over a small range, it is not significant. Larger sumps have more surface area to provide radiative cooling, and typically also have yubes running through for even more surface area.

An extreme example is the air-cooled Volkswagen. The oil did a large part of the engine cooling (via its oil cooler and finned cast-in sump), not just the air. Oil temps are much higher in this car. The bolt-on deep sump pans have extra fins and more importantly, a improves pickup geometry so the car doesn't starve on hard cornering or during high cornering angles (like in a baja bug).

Both the factory and author John Muir (not the naturalist, though a relative) argued that the extra oil only meant it took longer to warm up in the morning (thereby increasing engine wear, by the way), but reached the same eventual temperature, despite the addition of 2-3 more quarts (up from 2.6 qts, a huge percentage increase).

I can't see a 10-15% increase in oil making a measurable difference one up to normal operating temperature.

2005 Seaside Pearl, BC#6
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post #18 of 91 (permalink) Old 10-13-2005, 06:45 PM
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See page 206 in th 04 manual concerning Prius. "Stated" primary function of oil is both for lubricating and cooling engine.
Page 283 indicates 1.6 qts. between L and F
There is absolutely no reason for running the oil quantity low, unless it makes you feel better.
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post #19 of 91 (permalink) Old 10-13-2005, 06:52 PM
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Of course it cools the engine. My point is that more oil doesn't mean cooler oil, at least within reasonable bounds. Sure, 1 quart isn't going to cut it, and 5,000 barrels wil never get too hot. But the fraction of a quart we are debating here is not a factor in engine temperature.

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post #20 of 91 (permalink) Old 10-13-2005, 07:16 PM
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Common sense would be that more quantity would provide more cooling. That was the main reason JC Whitney sold so many high oil capacity, finned, aluminum cast, oil pans. Better refined oils along with additives have allowed engines to successfully run hotter and still get adequate lubrication. But 3.9 qts. is pretty close to bottom line for a 1 1/2 Litre engine. I'm sure that's why Toyota regularly services with four qts.
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