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Thread: Looking for a better engine oil

  1. 20th June 2024, 08:04 PM #1
    Graeme
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    Looking for a better engine oil

    I recently switched from Castrol Magnatec 5W30 to Castrol Edge A3/B4 5W40 for increased bearing protection including for when towing in hot weather for the 4.4 TDV8 in my L322. A digital oil pressure gauge is fitted.
    Idle oil pressure from as soon as the oil is up to temperature has consistantly been 12-13 psi which is as per specs for normal operation. However a climb up to the top of the Warrumbungles from the west using gears manually while towing a 2T van caused idle oil pressure to only be 9 psi when stopping at the van parking area for the observatory. Whilst this is still above minimum specs, it seems to indicate that the oil doesn't maintain its viscosity at higher temperatures.

    Is there another A3/B4 5W40 oil that has better stay-in-grade characteristics?
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  2. 20th June 2024, 08:09 PM #2
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    V8Ian
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    I've always trusted Penrite, but no experience with it in your situation.

    SEMI SYNTHETIC 5W-40 | Penrite Oil.
    If you don't like trucks, stop buying stuff.
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  3. 20th June 2024, 09:06 PM #3
    Graeme
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    Thanks, but I'd be reluctant to use a semi-synthetic oil without expert advice.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  4. 20th June 2024, 10:09 PM #4
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    Slunnie
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    I was chatting to an engine builder near me, his reputation is in race and high output engine building. His recommendation is to always run a diesel engine oil for best protection. He also said the reason why it isnt recommended in petrol engines is due to the Cat's, but they're not tested and probably not working anyway, but the diesel oil has better lubrication properties than the oils designed for petrol motors. This is his experience. He runs this in his work turbo Falcon, and that is over 1M km now, running perfectly and not been opened. He did say a couple of oils which he thought were good, but I cant recall with enough certainty which ones they were.
    Cheers
    Slunnie


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  5. 21st June 2024, 06:08 AM #5
    Graeme
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    Castrol promote their Edge A3/B4 for use in both petrol and diesel engines, but obviosuly not diesel-specific so might not be the best choice in some respects.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  6. 21st June 2024, 07:41 AM #6
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    Pedro_The_Swift
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    Have you searched on BoB The Oil Guy's sight?

    I seem to remember asking this question a little while ago....

    here....


    Just a moment...
    Last edited by Pedro_The_Swift; 21st June 2024 at 08:07 AM.
    "How long since you've visited The Good Oil?"

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  7. 21st June 2024, 07:54 AM #7
    Graeme
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    Maybe next time I'll try Penrite HPR 5 5W40 (full synthetic) to see if it stays in grade any better. It meets the Ford specs and has my preferred A3/B4 rating rather than the fuel efficient A5/B5 rating.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  8. 21st June 2024, 08:09 AM #8
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    Pedro_The_Swift
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    You dont think LR would use a less than stellar oil just to increase its fuel numbers Graeme?.... omg shock horror..
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  9. 21st June 2024, 08:24 AM #9
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    V8Ian
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    If using diesel oil in a petrol motor, only do so from new. I used diesel oil in a high mileage, petrol Cruiser motor, years ago. End of engine, the diesel oil had more detergent than the petrol oil. Not sure if that situation is still relivant.
    If you don't like trucks, stop buying stuff.
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  10. 21st June 2024, 08:45 AM #10
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    Looking for a better engine oil

    I think the logic is that diesel oils also still have higher quantities of zinc which was a oil spec older style petrol engines preferred. Modern petrol oils have less zinc which lubricates the top end.
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