bendelaurence
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Is 10w-40 semi Syn oil the right grade for a 3.9 v8 disco engine?
Oil grade?
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BOOMER
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oldskool
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That will be fine
bendelaurence
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I've bought a defender with I disco engine in it, but only want to top up for now. When I do an oil change what's the best oil to use? I want to look after and protect my beloved v8 so that it may give me many years of pleasure :-D
bendelaurence
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Oh, and does anyone know the refill capacity?
nathan5346
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Not off hand but u need 2 x 5litres fer an oil change but u'll av plenty fer topping up
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discool
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The book says 6.10 liters but I find that 6 litres which includes the filter is ok, the 0.10 must be remaining in the engine somewhere. 
bendelaurence
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The book says 6.10 liters but I find that 6 litres which includes the filter is ok, the 0.10 must be remaining in the engine somewhere.
Oh, nice one!! And it's 10w-40 yeah?
discool
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yup 10w40 semi or part synthetic.
bendelaurence
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Great! Much appreciated mate
sierrafery
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Tuskenraider
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I assume you have tested all other oils in identical test conditions to be able to claim that
Its probably ok to use in landy engines as they are old engine designs, you wouldnt see me putting it in anything modern though.
discool
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An deff not in a high reving petrol engine. Although it does meet some of the specs.
I still have my SAAB 900 Aero Turbo that I bought at 45k miles.
That same day I changed the engine oil and filter. Put in Ovoline Tractor Universal, and it's now on over 150K miles and as clean as a whistle inside.
So why do you you think these oils aren't up to the job?
I'm assuming you have no experience of them.
My TD5 Disco has just done its last 60K miles on that same oil.
What's the problem?
CharlesY
I assume you have tested all other oils in identical test conditions to be able to claim that
Of course not! There are too many crappy oils out there to waste time and money doing that.
I bet you think "fully synthetic" oils are better lubricants than mineral oils.
If so, you'd be wrong. It is far better for both the engine and your pocket to use Tractor Universal, and change it every 5k - 6k miles, than to use SYNTH that costs five times as much and "lasts twice as long". Doing that leaves all the crappy stuff inside the engine for "twice as long".
Its probably ok to use in landy engines as they are old engine designs, you wouldnt see me putting it in anything modern though.
Your loss! I buy a 210 litre barrel once in a while, and use it on EVERY engine here.
CharlesY
sierrafery
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I might be dumb again
(knowing that the Saab 900 is diesel)..... but i must ask did u use this oil in petrol engines too?
I think the last 210 barel I bought was just over £1.10 per litre.
It was cheaper than Diesel FUEL! Then I had another nice steel oil drum!
These are top class oils made to extremely high specifications, so that as far as possible they are "farmer proof".
The best thing one can do for any engine is to change the oil and filters regularly. That is the ONLY way to physically REMOVE the harmful crap and acids and particles from inside the engine.
However, the synthetic oil experts always know better, that it's OK to leave all the harmful crap and acids and particles inside the engine for 20,000 miles or longer. I have old fashioned ideas about that. I also have long-lasting engines that are nice and clean inside.
Charles
Tuskenraider
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Is it one of these you use?
http://www.ovoline.co.uk/ovoline/pdf/agricultural.pdf
I am guessing maybe the SUTO?
I work for Ford at their Powertain Development Centre as part of the Fuels and Lubes team and I dont recognise that spec at all which tells me its very old. I will do some digging though and see what it is
Generally petrol engines (especially turbos) run at much higher temperatures to diesels so a oil specced just for diesels may not be able to withstand those temps for long periods of time. Its one reason why its not a good idea to fit a diesel turbo onto a petrol engine as the turbine housings can crack due to the higher EGT's
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