Mike,
Everyone has an opinion on this subject. If you
are happy with 20 wt, use that. If you want to
try 90 wt gear oil, give that a try. I don't
believe any of these choices are going to damage
anything. It is pretty easy to switch if you
want to try something else. Someone will tell
you that the gear oil and motor oil are not
measured on the same scale. I guess that someone
is
me. https://bobistheoilguy.com/viscosity-charts/
John Twist knows more about MGs than just about
anyone, but some equally wise people disagree
with him on this particular subject. I don't
think you are going to find a "right" answer.
-Steve T.
At 04:17 PM 6/15/2021, Michael MacLean wrote:
>I watched a recent John Twist video today on
>fitting H type SU carbs to a T type MG. In the
>video he says to use 90 wt gear oil in the
>dashpot. He also said the lighter oils and ATF
>that so many people recommend contribute to the
>early wear and tear on the carb. Anyone else
>using this weight oil in the carb? All my life
>I have been putting 20 wt oil inthe dashpot.
>Mike MacLean
>1969 MGB GT
>1960 Austin Healey Sprite
>1956 Austin Healey BN2 LeMans
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