One of the requirements for an oil to be SAE rated is the manufacturer has to guarantee that his oil can mix with any other SAE rated oil. My personal opinion is mixing the two is just a marketing ploy by some manufacturers designed to sell more of their oil.

This means that you can also mix any synthetic oil with any Dino oil, but why unless you are in a situation where you have to?

I run synthetic in vehicles where the manufacturer recommends synthetic like my Mercedes or in vehicles where I want to extend my oil changes. I used to drive over 50,000 miles a year but these days I'm down to about 35,000 miles a year. Everything else gets conventional (Dino) oil. Conventional oil is just too cheap to not use and change often.

Thanks, Tom Hargrave
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-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of Dan N
Sent: Thursday, July 2, 2020 9:54 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Changing oil: Hot, Lukewarm, or Cold

the presence of Synthetic Blend oil means it's OK to mix synthetic and dyno oil but the only thing the public do not know is the ratio... I've heard it's about 75% synthetic and 25% conventional oil depending on the brand.

On Thu, Jul 2, 2020 at 7:46 AM David McNeely <davmcneely40@gmail.com> wrote:

> There are times and circumstances where the exact oil that one 
> normally uses is not available.  Though the camper uses very little 
> oil, I have had to add oil on rare occasion.  mcneely
>
> On Thu, Jul 2, 2020 at 7:28 AM Dan N <dn92610@gmail.com> wrote:
>
>> there's the Synthetic Blend oil ready to use, no need to mix yourself.
>>
>> On Wed, Jul 1, 2020 at 9:35 PM OlRivrRat <OlRivrRat@comcast.net> wrote:
>>
>> >         Posed that question to the Tech's@ Valvoline several years 
>> > ago
>> &
>> > got this response >
>> >
>> > Sure, No Problem,, But Why Would You Want To ~
>> >
>> >
>> > On 1 Jul , 2020, at 8:32 PM, David McNeely wrote:
>> >
>> > > Is it ok to mix synthetic and conventional oils?
>> >
>>
>
-----
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