Here's a link to a very good oil article.

https://www.popularmechanics.com/cars/car-technology/a53/what-oil-does-my-car-take/

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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