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From: johngdole on 22 Mar 2007 19:30
Here is what Chevron says:

http://www.chevron.com/products/prodserv/nafl/auto/content/faq.shtm

"Can I mix different viscosity grades of motor oils?
Yes. It is always advisable to not mix motor oils, however, different
viscosity grades of the same motor oil are compatible. Be aware that
mixing viscosity grades will turn out a product that is different in
viscosity than either what was originally in the engine or what was
added."

So it's not like using 50% 10W and 50% 30W will give you 100%
10W-30. ;) ;) ;)

In a multi-grade oil, a polymer is added to the lower weight base oil
that allows the viscosity to change at higher temps. When the polymer
additive wears out you'll end up with a thin base weight oil.


mrdarrett(a)gmail.com wrote:
> Is it ok to mix 5W-30 with 10W-30 oil for a '96 camry? (approx. 2
> qts. of each)
>
> How about for a '99 camry?

From: Daniel on 22 Mar 2007 19:37
mrdarrett(a)gmail.com wrote:
> Is it ok to mix 5W-30 with 10W-30 oil for a '96 camry? (approx. 2
> qts. of each)
>
> How about for a '99 camry?
===
Best idea is to use only that oil type and viscosity recommended for
your engine in the owner's manual.
Why would you consider mixing oil viscosities rather than just buying
the correct grade?

From: Mark A on 22 Mar 2007 23:18
"Daniel" <nospampls2002(a)yahoo.com> wrote in message
news:1174606663.140880.176840(a)p15g2000hsd.googlegroups.com...
> Best idea is to use only that oil type and viscosity recommended for
> your engine in the owner's manual.
> Why would you consider mixing oil viscosities rather than just buying
> the correct grade?

Maybe he has some laying around his house and wants to use it up.

Mixing the two oils is fine. Some people on this newsgroup are raising
ridiculous concerns. Most dealers use 10W-30 even though the manufacturer
recommends 5W-30.


From: mrdarrett on 22 Mar 2007 23:58
On Mar 22, 7:18 pm, "Mark A" <nob...(a)nowhere.com> wrote:
> "Daniel" <nospampls2...(a)yahoo.com> wrote in message
>
> news:1174606663.140880.176840(a)p15g2000hsd.googlegroups.com...
>
> > Best idea is to use only that oil type and viscosity recommended for
> > your engine in the owner's manual.
> > Why would you consider mixing oil viscosities rather than just buying
> > the correct grade?
>
> Maybe he has some laying around his house and wants to use it up.


Yep, that's exactly it. I've got way too much 5W-30, and not quite
enough 10W-30.


> Mixing the two oils is fine. Some people on this newsgroup are raising
> ridiculous concerns. Most dealers use 10W-30 even though the manufacturer
> recommends 5W-30.


Which is good too, right? Less engine wear. Although perhaps
slightly worse fuel economy...

Michael

From: mrdarrett on 23 Mar 2007 00:11
On Mar 22, 3:30 pm, johngd...(a)hotmail.com wrote:
> Here is what Chevron says:
>
> http://www.chevron.com/products/prodserv/nafl/auto/content/faq.shtm
>
> "Can I mix different viscosity grades of motor oils?
> Yes. It is always advisable to not mix motor oils, however, different
> viscosity grades of the same motor oil are compatible. Be aware that
> mixing viscosity grades will turn out a product that is different in
> viscosity than either what was originally in the engine or what was
> added."


Well that could be a problem... creating a new viscosity than either
original bottle... chemicals are funny that way.

I guess I'll just use up my 5W-30 in my '96 camry during next winter.
Spring's here... too hot to use 5W-30 in the '96 in Sacramento.

Michael

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