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post #1 of 17 (permalink) Old 11-29-2005, 11:25 PM Thread Starter
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Default Engine Oil in Prius

What brand and type of motor oil do you use in your Prius? Have you any conclusion about the superiority of one name brand an/or synthetic vs petroleoum based over another brand and type?
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post #2 of 17 (permalink) Old 11-30-2005, 02:02 AM
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There are several dozen recent threads on Prius and oil. I hesitate to mention that the 06 Honda Civic hybrid specifies 0W/20 wgt oil only to increase MPG. Combine that with a half quart low quantity and you may squeeze another couple miles per gallon.
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post #3 of 17 (permalink) Old 11-30-2005, 09:01 AM Thread Starter
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Default Prius Oil

Quote:
Originally Posted by hyperion
There are several dozen recent threads on Prius and oil. I hesitate to mention that the 06 Honda Civic hybrid specifies 0W/20 wgt oil only to increase MPG. Combine that with a half quart low quantity and you may squeeze another couple miles per gallon.
Would mileage and performance in the Prius be enhanced by using 0W/20 or 0w/30 oil?
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post #4 of 17 (permalink) Old 11-30-2005, 10:13 AM
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Default Re: Prius Oil

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Originally Posted by prius07
Quote:
Originally Posted by hyperion
Would mileage and performance in the Prius be enhanced by using 0W/20 or 0w/30 oil?
I dunno about mileage and performance, but using the wrong weight oil would certainly degrade the warranty.

April 2004 Silver
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post #5 of 17 (permalink) Old 11-30-2005, 11:12 AM
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Default Oil

Haven't gotten to the first oil change yet.
when I do it'll be Mobil 1.

Jerry N
People sleep peaceably in their beds at night because rough men stand ready to do violence on their behalf.
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post #6 of 17 (permalink) Old 11-30-2005, 02:10 PM
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I've switched to Mobil1 5W-30 in my mom's Prius. I've used Mobil1 in my Honda Rebel 250 and it has gone a phenomenal over 90,000 miles without any problems, but that was 20W-50, which is definitely not what you want to put in the Prius.

However, for my Prius I've done a bit more research and I'm using Pennzoil Platinum 5W-30 in it.

Of course, both are synthetics. And unless you live close to the arctic, I think you should stay with 5W-30, not switch to 0W-20 or 0W-30, because you could be opening up a lot of questions if you ever need warranty work.

From what I've read, the Mobil1 at 30 weight is within the specifications to define 30 weight, but at the low end. The Pennzoil Platinum is supposed to be a bit higher within the specifications. But both should be fine to use. There might be some better, but those oils are harder to find.

There is a website that shows the specifications for many different weights and brands of oil, but I can't find it at the moment. Maybe somebody else would know, or when I find out I'll post it.
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post #7 of 17 (permalink) Old 12-01-2005, 02:49 PM
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Default Synthetic Engine Oil

To Whom it may concern,

I've used Amsoil Synthetic for over 15 years in various autos and all the motorcycles I've owned with no problems or any type of grief.

To answer previous questions asked I submit the following Amsoil data:
Amsoil recomends changing engine oil at 1 year or 25,000 miles.
There is a good deal of test data available of cross country truckers that have gone over 100,00 miles with an Amsoil bi-pass filter and no oil changes.
Change the normal oil filter every six months. They recommend Amsoil filters as they are designed for extended service.
Warrentee void claims by dealers are commented on by Amsoil on their webpage and written data saying that warrentees are fully supported by auto manufactures and Amsoil itself. Along with this they state they will provide legal data and support should anyone find a dealer attempting to invalidate a warrentee based on frequency of oil changes or the use of a synthetic.
Amsoil provides much information concerning testing done by independent testers as to the performance of Amsoil versus any other synthetic or petroleum based lubricant available.

End of Amsoil data.

My independent auto service tech told me post a valve adjustment on a 1989 Honda Accord LX-I that the internals of the engine were surprisingly clean for an engine with 125,000+ miles. "It looks like new" was the quote.
Many other synthetics have value but not the long term change interval nor the type of protection under high temperature and performance demands of many engines. See Amsoil data at http://www.amsoil.com for specifics on all of their wide range of products.

The only thing I don't particularly like is that Amsoil is a network marketing organization. In their favor they do NOT use a scheme that makes only the very top rich and all other poor.

I'm on the waiting list for a 2006 Prius and will change to Amsoil after about 5,000 miles to allow for engine break-in.
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post #8 of 17 (permalink) Old 12-02-2005, 10:16 PM
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I'd be very careful if I were you. Sure, there is a great chance that the oil and filter will stand up to Amsoil's change interval. But all they will clearly state regarding voiding manufacturer warranty is that the oil itself meets or exceeds specifications, thus will not void the warranty, but does not clearly state that extending the manufacturer's change interval won't void the warranty.

Besides, as I have been saying for quite a while, it isn't just the oil breaking down that is a problem, but combustion blowby contamination. Nobody has been able to answer to my satisfaction as to why contamination is not an issue. I understand oil breakdown perfectly, but even oil that stays brand new will get contaminated.
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post #9 of 17 (permalink) Old 12-03-2005, 04:18 AM
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All of the respectable car mag articles (I've read) on conventional vs synthetic oils conclude that little if anything is gained by using the more expensive synthtics. The one exception is for exceptionally COLD weather. Synthetics don't stiffen up as much.
Radical claims of increased MPG's or performance by an oil Co. are generally made by salesmen...not engineers.
Good oil is cheap and easy to change. It doesn't breakdown..it just gets dirty.
Having said all that.. I just put 5-30 Castrol Syntec in my Prius at 10K miles. OK..so I'm a pushover for a pretty car... The Prius ICE stops and starts a lot so I figured..what the heck..

2004, White, full package.
Scan Gauge,
Castrol Synth. oil @ 2500 miles.
Hey.. \"it's just a car...\"
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post #10 of 17 (permalink) Old 12-03-2005, 09:36 AM
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One thing about synthetics is clear; they are not based on petroleum. If we are to wean ourselves of oil-dependency, using non-fossil substitutes is another part of that effort.

Walt(falling off soapbox)

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