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Thread: What oil viscosity do you recommend?

  1. 07-31-2007, 01:39 PM #1
    Zithlord
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    What oil viscosity do you recommend?

    What oil viscosity do you recommend in a standard 1971T engine, lower and upper numbers(cold viscosity and hot viscosity)?

    John
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  2. 07-31-2007, 03:08 PM #2
    HarryD
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    John,

    Many debate this long and hard but you will find most run 20W50 (Dino), 5W50 (syn) or 10W40 (Diesel).

    Personally, I have been using 20W50 dino but am switching to a 10W40 Diesel due to lowered Zn and P in the USA.
    Harry

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  3. 08-01-2007, 01:19 PM #3
    Zithlord
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    I filled it up with mineral "Castrol Classic" 20-50W. Its specially made for older cars. The old oil was very black, but I found no metal chips on the two magnets, just a very little metal dust in the groove around the magnet on the bottom plug.

    John
    Early 911S Registry #931
    --------------------------------
    1971 911 2.2S Coupe Albert Blue
    1971 911 2.2T Coupe Tangerine
    2005 997 C2S Coupe special 1965 slate grey
    1978 911 3.0 SC Targa Silver w/chrome trim
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