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Thread: Oil recomendations for a 1990 RRC 3.9L?

  1. 10th December 2009, 03:55 PM #1
    CSK
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    Oil recomendations for a 1990 RRC 3.9L?

    Hi,

    I have been having oil pressure issues on startup since I changed the oil to Penrite HPR30 with a Fram oil filter when I purchased the RR. Oil pressure wasnt an issue on the old oil, however, I am not sure on the grade the previous owner used.

    The engine has 174 000kms on the clock and the oil level on the dipstick has dropped about 2-3mm in about 2500kms. Is this level of consumption normal?

    In have been told that the 20-60W oil in the engine at the moment is too thick but I dont want to run an oil to thin that the engine becomes an oil burner (blue smoke etc).

    Can anyone make any recomendations for a high quality engine oil suitable for me? Lots of highway driving.


    Much appreciated!
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  2. 10th December 2009, 04:11 PM #2
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    Blknight.aus
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    I'd start out with nulon 10-40 non synthetic and see what happens. if it burns that up it to 15-40 or 15-50
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  3. 10th December 2009, 05:18 PM #3
    CSK
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    I saw that someone on this forum uses Penrite HPR Diesel oil?!?!?!

    Is this good/ bad for the motor?
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  4. 10th December 2009, 07:25 PM #4
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    Blknight.aus
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    wont hurt the engine diesel oil is close to normal oil in most respects but usually has a higher detergent and suspension blend.

    IF you have things blocked up by carbon deposits or sticking lifters occasionaly running diesel grade oil in a petrol will shift them, theres a bunch of addatives that will do the same as will half a liter or so of auto trans fluid.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  5. 12th December 2009, 09:21 AM #5
    PhilipA
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    I have been having oil pressure issues on startup since I changed the oil to Penrite HPR30 with a Fram oil filter
    If the red light stays on on start up and the tappets rattle, it is not the oil.

    It is that the anti drain back valve in the filter is of poor quality or damaged/leaking. Try another filter. Ryco are good, so is Purolator .

    Regard sPhilip A
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  6. 12th December 2009, 09:48 AM #6
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    djam1
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    I have used Penrite HPR30 or HPR Gas on the last 3 Rovers I have had with no issue.
    I had a tired old Rangie towing over 2 Tonnes in 50 degree plus heat and ran HPR50 without issue. Wouldnt use HPR50 in cold weather though
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  7. 12th December 2009, 10:40 AM #7
    PAT303
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    I always ran HPR diesel in my V8,with eight cylinders and lots of oil gallerys I think a bit more detergent's a good thing. Pat
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  8. 12th December 2009, 12:14 PM #8
    CSK
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    Quote Originally Posted by PAT303 View Post
    I always ran HPR diesel in my V8,with eight cylinders and lots of oil gallerys I think a bit more detergent's a good thing. Pat

    Hi.

    How many KMs on your V8? How many KMs in total did you run the diesel oil in it for?

    I really love my Range and don't want to ruin the motor!


    Cheers.
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  9. 15th December 2009, 12:52 PM #9
    RoverP6B
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    The defining factor for the type of oil to use in the Rover V8 engines of any capacity is the oil pump.

    If your 1990 Range Rover has a camshaft driven oil pump which I expect it does, then the minimum weight oil you should use is 20W50. You can use a 20W60 oil as you are currently using and it will be fine. The suggestion that it is too thick is nonsence.

    If your engine is fitted with a crankshaft driven oil pump, then you can use a thinner oil,..10W40, 10W50, 15W50, 15W60. Or continue using 20W50 or 60.

    Thinner oils such as 10W...should not be used in the former type as the oil pump is not as efficient at circulating thinner oils through the engine.

    A drop of 2 to 3mm in 2500km is perfectly acceptable.

    Ron.
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  10. 15th December 2009, 04:24 PM #10
    PhilipA
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    Er, so how come Land Rover recommend 15-40 for a 3.9 90 in the manual ????
    Also most oil companies recommend a 40 oil.
    I am looking at the "Driveway Service Data " in the back page of the folder that came with my 92.

    Under Engine Oil
    It says
    Viscosity Grade 15/40
    Topping Up: To raise level from "Low" to "high" on Dipstick; 1.4 litres (2.5 pints)
    Note it does not say "or 20-50 or 30-60"
    Page 140 of the manual gives a more detailed graph and says 15/40 is OK from -10 to 50C which is as high as it goes .
    20w/50 and even 25W/50 are allowed with limits to the W temps
    Mine loves it.
    Regard sPhilip A
    Last edited by PhilipA; 15th December 2009 at 04:30 PM. Reason: more information
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