It might be worth changing the valve guide seals.
It can be done with compressed air, or a bit of rope fed into the cylinder
through the spark plug hole.
Or, if you're not losing more than a quart per 500 miles, live with it- old
engines do burn a bit of oil...
Toby
> Hi to the list,
>
> I wanted to query the roadster experts out there on a recommendation for
>the
> best weight oil for a U20 that is puffing blue smoke on take off. I have long
> suspected either the valve guides and seals or rings have wear but doing a
>wet
> and dry compression check shows hardly a difference in compression. The car
>is
> running so good that I don't want to take it apart quite yet. I have been
> running Castrol 20/50 for they claim to control oil burn off. Is this the
>best
> for my situation or is there a straight weight I could be running? Thanks,
>
> Tom 69/2.0
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