Hi Kelvin,
It's interesting to note that a few years back when Castrol was labeling
their 10W/30 and 20W/50 oil as being turbo approved, I never saw Castrol
10W/40 labeled as turbo approved. My understanding was that the turbo
bearings cooked the engine oil and the 10W/40 left deposits which were
not good for the bearings.
I once heard a story of someone cracking a transmission case in a Land
Rover in Africa. The oil leaked out so they filled the transmission case
with bananas, and kept on driving. Don't know if it was an OD or not or
whether it left any hardened deposits.
:-)
Don Malling
Dodd, Kelvin wrote:
> Like all historical documents, factory manual recommendations must be
> taken in context. The oils originally specified by brand and type had
> very different qualities than oil currently available.
>
> The recommendations are a useful guide, but modern alternatives and
> updated user information must be examined.
>
> A perfect example of this is the gear lubricant specified for the
> Rover/Triumph 5 speed gear box. The factory manuals specify 90W, which
> proved to be disastrous in the North American market.
>
> Detergent packages used during the 70-80s were a concern when the oils
> were used for gear lubrication. During that time period the recommended
> gear oil for MGB transmissions was a non-detergent racing type oil such
> as Valvoline Racing. Currently oil packages have changed dramatically
> with the popularity of turbo charged engines, and I have absolutely no
> clue what to recommend, but I don't think you would go far wrong by
> using a regular 20W 50 non synthetic engine oil.
>
> Kelvin.
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