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Is "abrasive ash" something pecular to multiweight oils?
Steve AKA Dr Deuce
----- Original Message -----
From: Richard Notton <Richard@fv623.demon.co.uk>
To: Military Vehicles List <mil-veh@uller.skylee.com>
Sent: Friday, January 28, 2000 3:25 AM
Subject: Re: [MV] SYNTHETIC OILS FOR MV'S AND AFV'S??
> *This message was transferred with a trial version of CommuniGate(tm) Pro*
>
> -----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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