Procedure for Checking Oil Level | FerrariChat

Procedure for Checking Oil Level

Discussion in 'Boxers/TR/M' started by ronc123, Jul 6, 2025.

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  1. ronc123

    ronc123 Karting

    Jan 12, 2008
    82
    Southern California
    Full Name:
    Ron
    I have a new-to-me 1990 Testarossa, USA version. I have read the owner's manual on checking the oil level and comments in this section. Does the following step-by-step procedure mirror what owners do to check their oil level? Your comments are most appreciated.

    1. Car is warmed up and running at temperature.
    2. Turn car off and quickly open the rear deck lid.
    3. Unscrew the oil filler cap and wipe the dipstick clean with a rag.
    4. Insert the oil filler cap and screw it back into place.
    5. Immediately unscrew the cap and ensure that the oil level is within the min/max level.
    6 Screw the cap back in and you are done...
     
  2. lagunacc

    lagunacc F1 Rookie
    Rossa Subscribed

    Aug 24, 2013
    4,359
    Yes. When cold that corresponds to the bottom of the dipstick.
     
  3. EDoug

    EDoug Formula Junior

    Apr 19, 2005
    266
    Southern Florida
    Ron, a finer point is NOT to keep your oil level near the max. Search crankcase ventilation on this forum. EDoug
     
    Elberoth, Rifledriver and Threeofnine like this.
  4. Tifoso1

    Tifoso1 F1 Rookie

    Nov 18, 2003
    2,602
    Pacific NW
    Full Name:
    Anthony C.
    I have also been taught that with dry sump engines; you should check oil level while the engine is running. This poses a little more risk with front engine cars but in the case of the Testarossa series, not so much since you can access the dip stick to the reservoir from the side.
     
  5. Threeofnine

    Threeofnine Formula Junior

    Dec 11, 2020
    393
    Birmingham, AL USA
    Full Name:
    Jarrod Heath
    You’re not supposed to keep the oil near max? What is a good level, maybe halfway? I tried searching crankcase ventilation but nothing popped up. Could you link a thread?
     
  6. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,086
    Cowboy Capitol of the World
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    Brian Crall
    What you should have been taught is to do it the factory way. Ferraris way is NOT with the engine running.
     
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  7. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,086
    Cowboy Capitol of the World
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    Brian Crall
    The car holds 3 1/2 gallons of oil. A quart or 2 low means nothing. Overfilled is a disaster.
    Dont even consider checking it below 170-180 degrees. Warmed up means oil temp, not water temp.
    Dont bother screwing cap on while checking.
     
    bernieb, ago car nut and Threeofnine like this.
  8. ronc123

    ronc123 Karting

    Jan 12, 2008
    82
    Southern California
    Full Name:
    Ron
    I followed the oil checking procedure I outlined in this post. When I checked the oil level, it was about 2 millimeters above the MIN mark on the dipstick. Should I add a half quart of oil, or even a full quart? How many quarts of oil between the MIN and MAX marks on the dipstick? What is the recommended oil to use? Thanks.
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,772
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    MIN to MAX is 2 liters (or 2.1 qts) -- see "Lubricants and Liquids" in Section 1 of your OM. Put 1 qt in and call it good.
     
    turbo-joe likes this.
  10. ronc123

    ronc123 Karting

    Jan 12, 2008
    82
    Southern California
    Full Name:
    Ron
    Thanks, Steve, for pointing this out in the Owner's Manual. In the same section, it indicates the recommended oil is 10W40. Should I use synthetic oil? Any brand you recommend?
     
  11. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    6,892
    Central NJ
    Full Name:
    Dominick
    Can't go wrong with Mobil 1 0w-40 euro
     
  12. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,772
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    I suppose next you'll ask "How often should I change my timing belts?" ;) Seriously, on the oil question everyone seems to have their own opinion/favorites. IMO, you need to consider your particular usage. In my case, living in the thermally hot hellhole of Central Texas and never storing/starting the car below 50 deg F, I used to run a 50/50 mix of (normal) Mobil1 10W40 and Mobil1 15W50 just to get a ZDDP level closer to what oils were in the 1980s. If you're in Southern California, and might be going up to the mountains occasionally and storing/starting in the 20s~30s F deg range, the Mobil1 FS 0W40 that Dominick mentioned would probably be a much better choice (and is a good general choice IMO) -- it has a decent level of ZDDP; whereas, the Mobil1 High Mileage 10W40 does not. Mobil seems to not even make the "normal" Mobil1 10W40 that I used to use (maybe it got "replaced" by that Mobil1 FS 0W40). You can see the specifications for the various Mobil1 products here by clicking on the "Mobil1 Product Guide" link down in the text:

    https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-fs-0w-40
     
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  13. bpu699

    bpu699 F1 World Champ
    Owner Silver Subscribed

    Dec 9, 2003
    17,678
    wisconsin/chicago
    Full Name:
    bo
    As a side note, they now make Castrol GTX classic 20/50, which has high zinc levels...

    Available on Amazon delivered to your door...
     
  14. ronc123

    ronc123 Karting

    Jan 12, 2008
    82
    Southern California
    Full Name:
    Ron
    Thanks for all your comments. Much appreciated..................
     

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