1. #1

    Oil type & weight

    First post in about 5 years, got busy.
    I had been using 10w30 oil in my 304, do I need to use a multi weight oil or straight 30 or 40 weight ? It has a 4 barrel & very heavy cam. Input pls. Thanks.

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  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    5,955

    Oil type & weight

    “Bob is the oil guy” has lots of info on motor oil.

    What is your oil pressure at idle and ar 2k rpm?



    10w30 is good id be sure to add or use oil with ZDDP for good CAM wear.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 03-07-2021 at 05:03 AM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: Oil type & weight

    Idle oil pressure is 35 to 40, 2000 rpm around 45 psi. Forgot to mention, I live in an area where summer temps are 90 to 110 degrees if that makes any difference.

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  4. #4
    Join Date
    Feb 2009
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    5,955

    Oil type & weight

    ZDDP lowers wear on lifters cam and bearings.
    Pressure seems fine. If you increase weight pressure will increase. Volume may drop.
    Do you have an oil cooler added? Oil coolers will help maintain viscosity and lengthen time to degradation and burning.

    Some 304 may have a filter bypass that using higher weight will bypass. The filter leading to faster wear.

    The coolant, radiator, water pump and thermostat cool your engine. So even on mild 60 deg days the engine reaches the same temp. It gets harder when it is hotter out to main the temp but if the correct parts are there it will be maintained.



    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  5. #5
    Join Date
    Dec 2010
    Location
    California
    Posts
    487

    Re: Oil type & weight

    Use the type of oil originally specified for the engine. Fir exampke, don't use 20w-50 in an engine designed for 5w-30. The engineers that designed the engine do know a few things.

  6. Re: Oil type & weight

    Quote Originally Posted by Jeepergeo View Post
    Use the type of oil originally specified for the engine. Fir exampke, don't use 20w-50 in an engine designed for 5w-30. The engineers that designed the engine do know a few things.
    Definitely follow the recommended oil viscosity as stated in the manual, and adjust according to climate. Just this winter, my uncle took his Wrangler from Atlanta to MI and he use 5W-20. It also got a new set of tires and shocks from 4Wheelonline and he had a smooth trip.

  7. #7

    Re: Oil type & weight

    IMO the only reason to increase the oil viscosity from the factory specs is when the engine is old and tired. Even then I'd only bump it up one notch.

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