Mobile One FS 0W-40 for RRC?
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Thread: Mobile One FS 0W-40 for RRC?

  1. #1
    FRESHMAN ROVER
    Join Date
    March 20th, 2019
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    Anadarko, OK
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    Mobile One FS 0W-40 for RRC?

    Hello,
    I'm new to the RR community.
    I've recently acquired a 1995 RRC with 57K miles. Any opinions about using 0W-40 for this vehicle?

    Thanks,

    David

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  3. #2
    FRESHMAN ROVER
    Join Date
    July 4th, 2018
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    19

    Re: Mobile One FS 0W-40 for RRC?

    Chad from his RRC advice had this to say.

    • Valvoline VR1 20/50 Racing Oil

      In April of 2019 I switched to Valvoline VR1 20/50 Racing Oil due to the higher zinc levels over the Shell Rotella T4. It's also the recommended oil of RPi Engineering, a Rover V8 Engine Specialist in the UK. Previously I was using Shell Rotella T4 Triple Protection 15W-40 Heavy Duty Diesel Engine Oil. I began using Shell Rotella T4 Triple Protection 15W-40 Heavy Duty Diesel Engine Oil around April 2013 when it was known simply as Shell Rotella T 15W-40. My RRC had about 200,000 miles on it when I switched. I had been using various Castrol grades previously. With regular oil changes at aproximately 3,000 mile intervals my engine still runs very strong. Which with the over 260,000 miles on it running the stock 3.54 gears and 33" tires, is certainly impressive for a 28 year old Land Rover V8.


    I use the Shell Rotella T6 at 5W 40. It does well in warm Southern California.

  4. #3
    SOPHOMORE ROVER
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    April 15th, 2014
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    Re: Mobile One FS 0W-40 for RRC?

    Hi David and welcome to the forum.

    Like the previous post, I feel there's more to oil choice than straight viscosity.

    Currently run my 3.9 motor on 5w40 synthetic, but of a specific content regarding zinc for protection. It has no obvious problems with that viscosity but it's difficult to tell what exactly is in your choice to give any informed decision.

    Viscosity is only dealing with how the oil stays in the places it's needed to give competent lubrication, the larger the tolerancing / wear, the higher the viscosity required to stop the oil leaking out of bearing locations it should be staying located in.

    Your low mileage engine should have no problems on that viscosity, 40 graded oil when hot (which is what that spec gives) will present you with no issues as far as my own experience has shown me.

    I use a diesel specced oil rated for a type of engine known to have very high demand on camshaft durability, this I feel orientates it to give a good performance in these Rover engines. In addition, it will also help with cam chain life too.

    The types available in your market are going to make some choices easier for you, the more consistently rated higher zinc oils seem to me to be a reasonable target for running these.

    As pointed out, oil condition plans a vital role in longevity. High wear potential items are always going to suffer if oil is allowed to degrade and in reality, has just as much influence over engine wear as oil choice.

    In summary, Xw 40 of decent level zinc (ZDDP) content and changed regularly will give best potential results. It doesn't have to be "headline " brand to do this.

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  6. #4
    SOPHOMORE ROVER
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    Portland, Maine
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    Re: Mobile One FS 0W-40 for RRC?

    Great video from RPI V8....
    https://www.youtube.com/watch?v=34fHcwuqB04
    Kevin
    88 RRC "Audrey"

  7. #5
    JUNIOR ROVER Mikieman's Avatar
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    February 19th, 2016
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    St louis
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    I use 5 w 20
    im an american i dont speak english

    91 classic..it is now parts

    92 lse... not a bucket of rust

  8. #6
    SOPHOMORE ROVER Tom109's Avatar
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    March 10th, 2010
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    Kingwood, NJ
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    Re: Mobile One FS 0W-40 for RRC?

    I use M1 0W-40 in my 1995 4.2L LWB. It 's an excellent full synthetic oil and has a 1100ppm zinc level.

    Mobil 1 Engine Oil Spec's June 2019
    Tom P.
    1965 exMod IIa 109 2.25p
    1995 RRC LWB 4.2L w/EAS
    1996 Discovery SD - Sold
    2025 = my next LR ?

  9. #7
    FRESHMAN ROVER
    Join Date
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    Anadarko, OK
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    Re: Mobile One FS 0W-40 for RRC?

    Thanks to all for the replies. This is an excellent site for information.

    David

  10. #8
    SOPHOMORE ROVER
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    Re: Mobile One FS 0W-40 for RRC?

    I believe these motors absolutely need to have zinc at sensible levels to prevent cam and follower wear.

    Seems like a decent spec Tom109, I know they differ for Mobil around different regions so worth getting a true reference for what's being sold in your own local supply chain.

    Mikieman, I thought most of this era motor was originally toleranced to run viscosity of 30 hot figure from its design specification. I'd be very sceptical about having a hot viscosity of less than that in general use.

    That RPI video talks alot of sense, and based on considerable experience of this motor. However, I disagree on using mineral oil for older engines based on nothing more than sentiment, it should be backed by much more in depth reasoned argument to put such a case.

    I believe they benefit from synthetic principally because of heat tolerance. Not necessarily from overall temp of oil but because of localised hot spots, in particular around the top side of combustion chamber.

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