Ahh, interesting. I've always used 30wt, and I wondered why others used
multigrades. I thought maybe they were taking the "use engine oil"
instruction too literally, and therefore using exactly what was in their
engine. But the transmission wouldn't seem to benefit from multigrade oil
in the same manner as an engine, to my mind. Neither would the carb
dashpots, IMO, but I suppose it makes no real difference in this
But anyway, why racing oil, particularly? Just higher quality?
Lawrie Alexander had this to say:
>Nope! I run straight Valvoline Racing 30 wt. in all my (and my customers')
>MGB gearboxes, both with and without overdrive.
>From: Bob Shaw <email@example.com>
>To: Andrew B. Lundgren <Lundgren@iname.com>; WSpohn4@aol.com
>Cc: firstname.lastname@example.org <email@example.com>
>Date: Thursday, July 20, 2000 6:01 AM
>Subject: Re: OD Lube
>>At 1:22 PM -0600 7/19/00, Andrew B. Lundgren wrote:
>>>After reading though the suggestions I put in ND30. I have noticed
>>>that my shifting in my newly-professionally rebuild O/D is not as
>>>smooth as it was in my non-O/D running HD30. Are most of you OD
>>>owners running an HD ranther than ND (No-Detergent)
>>I run the same Castrol 20/50 in my overdrive that I run in my engine.
>>I know John Twist does the same. I would guess that Lawrie does also,
>>but he can confirm or deny that. A new box is going to be a bit
>>stiffer for a time. Run it in and should loosen up a bit. It took
>>mine about 5000 miles to really get nice.
>>Check out Shaw's Garage at http://www.mlcltd.com/shawsgarage/
>>My British Car is NOT leaky - it's merely marking its territory.
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.