Charley: The shop manual is clear about not using detergent oil in the
tranny. I assumed the Castrol 20-50 was a detergent oil so I have been using
a 30 wt. non-detergent. The 75-80 Bentley Manual says to check the dipstick
after filling but you and I agree that the later Bs didn't have a dipstick!
Frank
Charley & Peggy Robinson wrote:
> Hi Frank,
>
> The later MGB gearboxes have no dipstick. The earlier ones do. Thus
> the characterizations, "top-fill" and "side-fill." My Bentley manual
> only covers models through '74, so it covers top-fill ODs only. You're
> right on your side fill: fill it to the bottom of the hole, etc., etc.
>
> As far as oil goes, the manuals adamantly aver that you use the same
> oil in the gearbox as you do in the engine. Then you have the
> mainly-temperature charts that tell you which viscosity of oil to use in
> the engine for the operating conditions you expect to encounter. I use
> Castrol 20-50 the year 'round because of the mild so central TX
> climate. It gets over 100F here but seldom below 25F.
>
> There was a spirited thread lately about oil viscocities to use in the
> gearbox. I think straight 30 weight won out but for the life of me I
> couldn't see why, given the diversities of temp extremes around the
> country as the seasons change.
>
> Hope this helps,
>
> Charley Robinson
> '69 B
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