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-----Original Message-----
From: jonathon <jemery@execpc.com>
To: Military Vehicles List <mil-veh@uller.skylee.com>
Date: 28 January 2000 07:28
Subject: Re: [MV] SYNTHETIC OILS FOR MV'S AND AFV'S??
>
>>I am considering running synthetic oils in all parts of my ex army
>>diesel land rover, and perhaps the ferret, any comments??????
>
>Why? Are you operating in extremes of temperature? You like to spend money
>needlessly?
>
Indeed, why ?
>This topic went around before with lots of action, things have been a little
>boring lately, time to spice it up!
>
Woke me up anyway.
Diesel LRs are quite late manufacture, the UK mil specifies OMD 80 - 15W/40.
The Ferret uses a RR B Range gas engine, all of these, B40, B60, B80, B81 were
designed for detergent SAE 30 to MIL 2104B/C/D (OMD 110). With relatively high
consumption designed-in to give longevity and tolerance to continuous full load
running, multi-grade oils are not recommended owing to the abrasive ash that is
formed. To quote the Specialist Engines Division of RR, "Its your engine, you
may put in it what you like, but . . . . . . ."
This engine range is based on the 4.25 litre Bentley unit of 1936 with the
initial modified design prototype actually on trial in late '43 or early '44 in
a standard Universal Carrier, the first production units were delivered in 1948
so the lineage is likely a lot older than you think, the attributes and
drawbacks of chemically altered multigrade lubricants would have been unknown
then.
Note also the _gearboxes_ of most 60's UK army vehicles use SAE 30 also,
especially in the case of the Wilson preselector types (Ferret, Saracen,
Saladin) anything else, 90EP gear oil in particular, will cause severe problems.
A multigrade will not take the mechanical stresses as advised by the tech depts
of the recognised lube makers. Transfer boxes and outwards to the wheels are
invariably 90EP.
RR B Range the engine oil temperature spec is thus:
Above 89ºF - SAE 50 to MIL-L-2104 or MIL-O-2104
89ºF to 23ºF - SAE 30 MIL 2104 (OMD 110)
23ºF to 5ºF - SAE 10 - OMD oils qualified to British spec DEF. 2101A
Below 5ºF - Arctic oil qualified to US spec MIL-O-10295
Richard
(Southampton UK)
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