Could be, I’m not qualified to have an opinion on the subject. Just something to consider doing a little more investigation into. 

Jim

Sent from my iPhone

> On Jul 26, 2022, at 11:46 PM, James Eaton <jk_eaton@hotmail.com> wrote:
> 
> 
> Yet other excellent Vanagon mechanics - Frank Condelli for one - recommend synthetic because it lowers engine wear on start-up, and stays reliably thicker at the higher oil temperatures our Waterboxers experience.
> 
> 
> James Eaton, Ottawa
> '91 Weekender
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> on behalf of Jim. Felder <jim.felder@GMAIL.COM>
> Sent: July 22, 2022 5:51 PM
> To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
> Subject: Re: Engine oil
>  
> When I had a 1990 Carat the local VW shop--a very good one--said I should
> never use synthetic oil in a waterboxer engine as it was not made with
> tolerances that matched synthetics in molecular size. Can't vouch for the
> fact, but I never used synthetic in the engine and the cylinders still had
> the original hatching and burnt no oil after 250K miles.
> 
> Jim
> 
> On Fri, Jul 22, 2022 at 9:51 AM Eric Caron <ericcaron96@comcast.net> wrote:
> 
> > Good to know.
> >
> >         I think I’ll weight on trying the 60 weight oil until engine oil
> > pressure or age indicate it.
> >
> >         I’ll stick with mobil 1 synthetic 15w 50 for now but I’m glad to
> > hear the 40 weight serves folks well as I wonder how easy my current oil
> > will be to get in the future.  Down south I struggled to find more then 30
> > weight in Walmarts as we traveled.
> >
> > Eric Caron
> >
> >
> >
> > > On Jul 22, 2022, at 1:41 AM, OlRivrRat <OlRivrRat@comcast.net> wrote:
> > >
> > >               EC
> > >
> > >       I have never ever used anything heavier that 10w40 in My or
> > Friends H2O Boxers
> > >
> > > & if a OilChange comes due in Fall I’ll go with 0w40,,, Been doing that
> > since My very 1st
> > >
> > > H2OBoxr in 83.5 ~ Also, Nothing but Full Synthetic once an Eng is done
> > with BreakIn ~
> > >
> > >
> > >
> > >> On 21 Jul , 2022, at 7:57 AM, Eric Caron <ericcaron96@COMCAST.NET>
> > wrote:
> > >>
> > >> Hi guys,
> > >>
> > >>       I’ve been using mobil 1 15W 50.
> > >>
> > >> It was very hard to find down south but locally still at Walmart and
> > the price was low when I last got it.  I hope it is still there when I go
> > back.
> > >>
> > >> I noticed the info here is for 40 weight.    And still a water boxer..
> > Don’t most use 50 weight or some even 60 weight?
> > >>
> > >> Eric Caron
> > >>
> > >>
> > >>
> > >>> On Jul 21, 2022, at 8:44 AM, Tom C <thomas.casal@GMAIL.COM> wrote:
> > >>>
> > >>> It’s actually only a gallon so it’s not super cheap but cheaper and
> > >>> obtainable locally.
> > >>>
> > >>> On Thu, Jul 21, 2022 at 8:40 AM Tom C <thomas.casal@gmail.com> wrote:
> > >>>
> > >>>> Hey guys,
> > >>>>
> > >>>> Mobile 1 15w-40 is getting hard to find locally. What do you guys
> > think of
> > >>>> the diesel oils like this the shell rotella stuff like this
> > >>>>
> > >>>>
> > https://www.autozone.com/motor-oil-and-transmission-fluid/engine-oil/p/shell-rotella-t6-diesel-engine-oil-hd-full-synthetic-15w-40-1-gal/354130_0_0
> > >>>>
> > >>>> 32.99 for 5 quarts is way cheaper than the 9.99 a quart for the
> > mobile 1.
> > >>>> I don’t mind paying the extra but if this diesel oil is just as good
> > may as
> > >>>> well save a few bucks. Thanks for any comments. Peace tom
> > >>>>
> > >
> >