Thanks for the intel Dennis. I only use mobile 1 too. I planned on driving
it a bunch last winter and nothing materialized but I’ll stick with the
15w50 mobile 1 all season now that I know unless I’m doing heavy winter
camping which I don’t foresee.

On Tue, Apr 14, 2020 at 9:31 PM Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> If a quality oil now reason to change it. Here is the number scheme super
> simplified. The 5w refers to the oil viscosity at 40C, (104F). The upper
> number refers to the viscosity at 100C, (212F). With the stock system (2.1)
> the oil to coolant heat exchanger acts as both a heater and cooler. So once
> under load for any significant time the oil will be close to coolant
> temperature regardless of weather. That is why we use multi-weight oils.
> Thin enough to start and flow and still protect when it gets hot. If you
> not using it much in winter no reason not to use the 15w-50 all year. I've
> used this almost exclusively until maybe 3 years ago when Mobil introduced
> the M1 5w-50. Unless you are using it daily in single digit temps the
> 15w-50 is fine. Even conventional 20w-50 is good down to about 20F.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Thomas Casal
> Sent: Tuesday, April 14, 2020 4:12 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: winter weight oil
>
> Hello Wise One's,
> When should I change this winter weight oil 5w50? I'm guessing now but
> didn't really put any  miles on it. Feels like a waste. cheers tom
>