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Thread: What grade engine Oil during Running-In

  1. #1
    Registered User jedwards's Avatar
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    What grade engine Oil during Running-In

    Gentlemen,

    I'm looking for some advice on what Engine Oil weight to use during Running in a newly rebuilt engine?
    She has just over 100 miles on the clock now (about 160 klms) so is still very fresh.

    I live in Perth, Western Australia, and are just entering Summer, when it can get quite warm. The temperature around this time of year peaks at around 30C, but as I drive few miles, I can expect it to easily get to 40 degrees before changing the oil again, but without A/C I wont drive her when temperatures exceed 36.

    I am not a big fan of fully synthetic Oils in older cars, as the production enginerring tolerances of modern cars require very thin lubricagting films, that don't do our old engines any favours at all, IMHO


    Any suggestions on a thick-ish old style non-synthetic Oil?

    regards
    Jeff
    Jeff Edwards - Perth, Western Australia

    Current Garage
    1963 Mercedes 190SL
    1953 Series 1 SWB Land Rover
    2007 Mercedes SL350 (daily driver)
    2017 Audi Q3

    Previous Restorations
    1971 Porsche 911T
    1969 Mercedes 250SL Pagoda
    1967 Aston Martin DBS
    1971 BMW 2002 Cabriolet
    1932 Austin 7 Tourer

  2. #2
    Registered User ejboyd5's Avatar
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    Re: What grade engine Oil during Running-In

    If you have already run 100 miles it doesn't make much difference. Use whatever oil you plan on using long term. As this is a new engine with closer tolerances than before the rebuild, "thickish" oil is not necessary or desirable. Drain oil, change filter, and refill oil at 300 miles.

  3. #3
    David Killion PappaWheelie's Avatar
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    Re: What grade engine Oil during Running-In

    Quote Originally Posted by jedwards View Post
    Any suggestions on a thick-ish old style non-synthetic Oil?
    Why non-synthetic??? I've seen, on a bespoke extreme pressure coefficient of friction test, empirical support for why Amsoil can guarantee oil change intervals of 25,000 miles, and why their testing of a welded oil pan drain plug 60,000 miles engine showed less wear than a "control" engine that got 3,000 mile oil changes with conventional oil. http://www.czforum.com/forum/index.php?topic=5566.0 Amsoil 20W-50 Dominator blows away Amsoil 20W-50 V-Twin, which blows away Mobil 1 20W-50 V-Twin.
    I've converted my vintage thumper to Amsoil 20W-50 Dominator in the interest of prolonged engine life. https://drive.google.com/open?id=0B9...9qT2VOUmZKMVhj Why settle for less than the best?
    Last edited by PappaWheelie; 10-15-2019 at 09:53 AM. Reason: removed underline half bracket

  4. #4
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: What grade engine Oil during Running-In

    Mineral oil to get a good mate between the piston rings and the cylinders. Synthetic oil to be used after break in. This is the way to do for airplane engines and cars.
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    André Hudon

  5. #5
    David Killion PappaWheelie's Avatar
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    Re: What grade engine Oil during Running-In

    Agree, André: how many miles would you recommend for break-in before upgrading? ejboyd5's 300?

  6. #6
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: What grade engine Oil during Running-In

    500 miles are recommended in varying RPM but not more than 4000. Coolant temperature must stay normal.
    ________________________________
    André Hudon

  7. #7
    Registered User ejboyd5's Avatar
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    Re: What grade engine Oil during Running-In

    Change at 300, again at 1000 to 1500. Oil is cheap, everything else is very expensive.

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