OMD 90 (general question)

Discussion in 'REME' started by Thread_Bear, Apr 11, 2007.

Welcome to the Army Rumour Service, ARRSE

The UK's largest and busiest UNofficial military website.

The heart of the site is the forum area, including:

  1. A coulpe (probably more!!!) of the lads from the regiment are currently running their motors on OMD 90. The guys from the fitter section have advised them not to because it might damage thier cars.
    someone years ago (when it was OMD80) once told me not to put it in my own car because of all the cleaning addatives.??????????

    This got me thinking "why would we put a mineral oil into a tank engine that gets super hot, and why would we put sh1t oil into Rolls Royce engines!"

    Obviously its an OMD oil, But is it purely mineral or is it semi synthetic?
    Does anyone know exactly what is in this oil? (grade / addatives or even the manufacturer etc).
  2. Ive always put it into white fleet vehicles with no problems, dont understand why it would do a civvi car any problems in that case then?
    Just a thought though, most of the Army's fleet is diesel and for civvi cars you do get a different type of oil for diesel, so maybe its bad to put OMD into a petrol engined car?
  3. I understand that it is Oil, Mineral, Detergent of whatever grade. I don't think the "80" or "90" can relate to the Society of Motor Engineers SAE grades. For example an SAE grade EP90 is an Extreme Pressure oil with a 90 rated viscosity. The type of oil you might typically use in say, a Land Rover, would be in a multigrade 20/50, or historically a straight 30.
    I recall hearing somewhere that OMD80 etc were single grade rather than multigrade oils but cannot say so with any certainty. If so, you would be better using a cheap multigrade.

    Multigrade oils exhibit different characteristics at different temperatures rather than simply getting thinner.

    Certainly, a straight single grade oil suitable for use in SIII petrol Land Rover would be far too viscous for a modern petrol or diesel car.

    I don't claim great expertise in this area but I think the above gives a good general outline.

    A quick google produces this:
    which may answer your question but doesn't provide all the background.

    More technical information is on this Ferret owners board along with this table:


    This appears to counter some of what I wrote about viscosity but is far more likely to be right than I am!

    Get googling!
  4. I used OMD 90 in old sheds i had that i wasnt too bothered about. Im pretty sure that OMD 90 related to a 10W 40 Semi Synthetic when you compare the specs with standard well known oils.

    I heard exactly what you heard with regards to OMD 80, it will clean out your engine and the result will be rattles and knocking! Never proven so i'm not sure!

    If you look on a can of OMD 90 there will be a ACEA number:

    Full ACEA specs are:

    * A1 Fuel Economy Petrol
    * A2 Standard performance level
    * A3 High performance and / or extended drain
    * B1 Fuel Economy diesel
    * B2 Standard performance level
    * B3 High performance and / or extended drain
    * B4 For direct injection passenger car diesel engines
    * E1 Non-turbo charged light duty diesel
    * E2 Standard performance level
    * E3 High performance extended drain
    * E4 Higher performance and longer extended drain
    * E5 (1999) High performance / long drain plus American/API performances. - This is ACEAs first attempt at a global spec.

    Modern diesels and high performance petrols need fully synthetic oil, so i wouldnt think of using OMD 90. If its your 1989 Ford Escort runaround then i wouldnt think twice, OMD90 would be fine.
  5. Just found this on a Land Rover website, Not sure how reliable, but he is the Admin bod and seems to know his stuff...

    OMD90 can be a semi or fully synthetic, severe duty oil intended for use in Diesel engines. It has a 10W30 viscosity grade and must meet or exceed API grade SG/CF-4 or ACEA grade A3/B3.
  6. well we used to put it in to CVR(t) engines (the old pertol Jaguar engines) but these guys are running it in a fairly new peugeot 206 and a Vauxhall Astra (both petrol i think)

    My car has always run on Mobil 1 and nothing else! i wouldnt dare put omd90 in it, its too precious to me!

    Why call it Oil Mineral Detergent if its not a mineral oil?
  8. what's in a name, long ago it was called OMD75, then OMD110, then OMD80 now its called OMD 90? next year it will be OMDMMV11, (roman for 2007). :D
  9. Basic terms are, if you put omd 80/90 in a petrol engine that has not used it before, the omd will clean out all the carbon type deposits in that engine, while this sounds a good thing initially, it could cause knocking and rattles as there will be more space between the bearing surfaces within the engine. However if you use omd from the start of the engines life ( as we do with petrol engines) then it works fine. Shouldnt be a prob for diesel engines.
  10. Been a while sinc eI was last bored enough to read the can,however IIRC it is manufactured by Silkolene and is equivilent to their Comp 4 brand ,ie 10w 30 semi synthetic. Have used it in a variety of engines with no ill effects.
    If however your engine is designed to run on fully synth, Mobile 1 etc then OMD 90 is not for you.
  11. Unless i'm very much mistaken, ( if so I appologise for my ignorance) but I seem to recall the drums of oil now marked up as OM90. does this mean its no longer a detergent type???
  12. havent seen them yet, all ours are still OMD..... only OM oil i have ever used is OM33 (CVRt steering brake fluid)
  13. anyone remember OM18, the old cherryade?
  14. 18 was used in 432 FIPs.

    Not sure if it was used for anything else, and is probably now obselete because of the new Bulldog engine.

    Any news on the specs of the new bulldog i.e. engine type etc as i'm out of the loop at the mo.

  15. Yep, also L60 FIP and Hyd Start.