Why do youi want to add MMO? It's usually only added if you are having
"Vanagon Clattering Valve Syndrome".  Even then there is other recourse.

To hold the valve clattering at bay here is what I do.

Mann or Mahle oil filter only.
Use 15W50  Mobil One Synthetic
Fill to 1/2 quart low  run it there all the time (more and it throws it out)
Change oil regularly  - by that I mean stay on schedule by the owners
manual and the Bentley, not by the oil manufacturers  recommendations.

Only once in a blue moon do I get the clattering syndrome, and even then
it's usually because I have neglected to change oil on time.

If all this doesn't work, THEN use the MMO.

Regards,

John Rodgers
88 GL Driver

David Prendergast wrote:

> Getting ready to change the oil today and have heard that I should add a
> touch of Marvel Mystery Oil.
> Do I fill the van with all the oil and then add a bottle or subtract
> some oil to compensate for the mmo?
>
> Thanks,
> Dave
>
>