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Synthetic Oil?

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Posted by Ron Guertin on April 22, 2006, 7:38 pm
Any advice on using synthetic oil?  I have an 06 Prius, coming up to the 5K
mile oil change.  My prior experience with synthetic oil has been great ...
saved the engine when my wife tore the oil pan off ...

Posted by richard schumacher on April 22, 2006, 11:38 pm

No reason not to.  In any case put in no more than 3.5 US quarts; in
fact 3 quarts even is fine.

Posted by Michael Pardee on April 23, 2006, 2:45 pm
I changed to synthetic at 15K, unsure whether there was still some breaking
in to do that the synthetic might have interfered with. I still don't know,
and would wait until 15K again if I had it to do over. But you're probably
okay at 5K.


Posted by B. Peg on April 24, 2006, 12:18 am
I put some Mobile 1 (5-30w) in at 1500 miles.  I don't like the idea of any
metal shavings from machining being encapsulated and hiding in the oil
channels somewhere to wreak havoc later.  Most of the other vehicles I've
owned (motorcycles) had the 600 mile service for that reason along with some
bolt and valve train adjusting.

However, at 5K the dealer did the job and put in Havoline 5-30 (reg. dino
oil).  Then they stuck on a sticker to bring it back at 8K miles instead of
10K.  I doubt if 3K changes are going to extend the life anymore than I will
own the car before replacement in 7-8 years.

I'm about to roll on the 10K so I may change it myself and go back to Mobil
1.  If for anything, just to keep dino oil varnish down as I really dislike
seeing the stuff inside an engine and trying to clean it out.


Posted by richard schumacher on April 24, 2006, 3:15 pm

If any metal shavings large enough to matter are not getting trapped by
the filter then the filter is defective.

Ditto that.  Follow the schedule given in the maintenance guide that
came with the Prius.  Anything more just helps the dealer with his boat


The '04 owner's manual advises not to change back and forth between
fossil and synthetic oils.  I buy bottled oil (Mobil 1) and give it to
the tech to use.

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