Mixing Motor Oil

11 Nov 2011, 08:07 am

I have leftovers from different oil changes in my Camry 2005:
syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
them in one oil change? It does not feel right to dispose perfectly
good motor oil.

11 Nov 2011, 10:22 am

"Wes" <wbraczko@gmail.com> wrote in message
news:ba4934ac-c0a2-4f92-a2b2-4617eaec0cb8@x8g2000yql.googlegroups.com...
>I have leftovers from different oil changes in my Camry 2005:
> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
> them in one oil change? It does not feel right to dispose perfectly
> good motor oil.

It is poor practice to do this, but it shouldn't cause any problem as long
as the residual oil is clean, dry, and of the required
viscosity and class.

11 Nov 2011, 05:13 pm

On Fri, 11 Nov 2011 09:22:02 -0600, "hls" <hls@nospam.nix> wrote:

>
>"Wes" <wbraczko@gmail.com> wrote in message
>news:ba4934ac-c0a2-4f92-a2b2-4617eaec0cb8@x8g2000yql.googlegroups.com...
>>I have leftovers from different oil changes in my Camry 2005:
>> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
>> them in one oil change? It does not feel right to dispose perfectly
>> good motor oil.
>
>It is poor practice to do this, but it shouldn't cause any problem as long
>as the residual oil is clean, dry, and of the required
>viscosity and class.

Then why is it poor practice?

17 Nov 2011, 01:08 pm

On 11/11/2011 05:07 AM, Wes wrote:
> I have leftovers from different oil changes in my Camry 2005:
> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
> them in one oil change?

It is not safe.

18 Nov 2011, 12:48 am

On 11/17/2011 10:08 AM, SMS wrote:
> On 11/11/2011 05:07 AM, Wes wrote:
>> I have leftovers from different oil changes in my Camry 2005:
>> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
>> them in one oil change?
>
> It is not safe.
>

Well, I wouldn't go that far. It won't cause a collision or something
like that. But you should not mix different weights of oil or
multiweight with single weight. I don't think mixing synthetic with
regular oil would do much harm. Lots of oil sold these days is
"synthetic blend" anyway.

So, leave out the 0W30 and you should be okay. That's just my opinion,
of course. For the few dollars it costs to fill up a Camry sump, you
might just as well get matching, new oil. Even at $5 per quart, it's
less than a tank of gas.

Regards,

DAve

18 Nov 2011, 05:13 pm

"spsffan" <spsffan@hotmail.com> wrote in message
news:ja4rkd019n3@news6.newsguy.com...
> On 11/17/2011 10:08 AM, SMS wrote:
>> On 11/11/2011 05:07 AM, Wes wrote:
>>> I have leftovers from different oil changes in my Camry 2005:
>>> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
>>> them in one oil change?
>>
>> It is not safe.
>>
>
>
> Well, I wouldn't go that far. It won't cause a collision or something like
> that. But you should not mix different weights of oil or multiweight with
> single weight. I don't think mixing synthetic with regular oil would do
> much harm. Lots of oil sold these days is "synthetic blend" anyway.
>
> So, leave out the 0W30 and you should be okay. That's just my opinion, of
> course. For the few dollars it costs to fill up a Camry sump, you might
> just as well get matching, new oil. Even at $5 per quart, it's less than a
> tank of gas.
>
> Regards,
>
> DAve

I think the oil companies usually have a canned statement
about their oils being compatible one with the other, but
it is not a practice I use. Oil is cheap, still.

18 Nov 2011, 11:44 pm

On Fri, 18 Nov 2011 16:13:53 -0600, "hls" <hls@nospam.nix> wrote:

>
>"spsffan" <spsffan@hotmail.com> wrote in message
>news:ja4rkd019n3@news6.newsguy.com...
>> On 11/17/2011 10:08 AM, SMS wrote:
>>> On 11/11/2011 05:07 AM, Wes wrote:
>>>> I have leftovers from different oil changes in my Camry 2005:
>>>> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
>>>> them in one oil change?
>>>
>>> It is not safe.
>>>
>>
>>
>> Well, I wouldn't go that far. It won't cause a collision or something like
>> that. But you should not mix different weights of oil or multiweight with
>> single weight. I don't think mixing synthetic with regular oil would do
>> much harm. Lots of oil sold these days is "synthetic blend" anyway.
>>
>> So, leave out the 0W30 and you should be okay. That's just my opinion, of
>> course. For the few dollars it costs to fill up a Camry sump, you might
>> just as well get matching, new oil. Even at $5 per quart, it's less than a
>> tank of gas.
>>
>> Regards,
>>
>> DAve
>
>I think the oil companies usually have a canned statement
>about their oils being compatible one with the other,

I think Click, Clack, and Pat Voss have said the same thing. Also
about mixing brands.

but
>it is not a practice I use. Oil is cheap, still.

19 Nov 2011, 09:55 am

On Nov 18, 11:44*pm, micky <NONONOmis...@bigfoot.com> wrote:
> On Fri, 18 Nov 2011 16:13:53 -0600, "hls" <h...@nospam.nix> wrote:
>
> >"spsffan" <spsf...@hotmail.com> wrote in message
> >news:ja4rkd019n3@news6.newsguy.com...
> >> On 11/17/2011 10:08 AM, SMS wrote:
> >>> On 11/11/2011 05:07 AM, Wes wrote:
> >>>> I have leftovers from different oil changes in my Camry 2005:
> >>>> syntethic 5W30, 0W30 and regular 5W30. I wonder if it is safe mix
> >>>> them in one oil change?
>
> >>> It is not safe.
>
> >> Well, I wouldn't go that far. It won't cause a collision or something like
> >> that. But you should not mix different weights of oil or multiweight with
> >> single weight. I don't think mixing synthetic with regular oil would do
> >> much harm. Lots of oil sold these days is "synthetic blend" anyway.
>
> >> So, leave out the 0W30 and you should be okay. That's just my opinion,of
> >> course. For the few dollars it costs to fill up a Camry sump, you might
> >> just as well get matching, new oil. Even at $5 per quart, it's less than a
> >> tank of gas.
>
> >> Regards,
>
> >> DAve
>
> >I think the oil companies usually have a canned statement
> >about their oils being compatible one with the other,
>
> I think Click, Clack, and Pat Voss have said the same thing. *Also
> about mixing brands.
>
> *but
>
>
>
>
>
>
>
> >it is not a practice I use. *Oil is cheap, still.

Thanks for all the input. I will stick to the advice of not mixing
different weights of oil.

19 Nov 2011, 09:22 pm

"Wes" <wbraczko@gmail.com> wrote in message
Thanks for all the input. I will stick to the advice of not mixing
different weights of oil.

***Probably the best scenario, BUT the reasons for not
mixing weights are few, at best. Weights are viscosities,
nothing more. If you are within the viscosity range for
the temperature, and if your oil is clean and has the proper
additives for the service you are running, there is no big deal.

I dont mix them, BUT my car requires 6 quarts, plus 3 ounces
of oil. I keep a bottle of oil from which the 3 ounces can be
made up. Then I add 6 quarts of oil per change, and top up
with the odd bottle.

This is not rocket science.

20 Nov 2011, 12:51 pm

On 11/19/2011 6:22 PM, hls wrote:

> I dont mix them, BUT my car requires 6 quarts, plus 3 ounces
> of oil. I keep a bottle of oil from which the 3 ounces can be
> made up. Then I add 6 quarts of oil per change, and top up
> with the odd bottle.
>
> This is not rocket science.

LOL, 195 ounces of oil versus 192 ounces of oil makes no difference at
all to the engine. You could even go wild and go up to 198 ounces and
allow for some oil consumption. In any case, it's far more cost
effective to buy oil in 5 quart jugs and just use how much you need for
each oil change.

Mixing Motor Oil

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