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Thread: GT-R oil overfilled

  1. #16
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    Quote Originally Posted by yrwei52 View Post
    I can accept your explanation on wide range of torque specs provided by Mazda. But how do you explain the inconsistency and discrepancy of fluid capacities?

    And under-filled engine oil on 2.5L NA but possibly over-filled on 2.5T from factory?
    Dip-sticks are imprecise. I've found variance on all vehicles vs stated capacity.
    Rear diff may be a typo in the manual. The M4 castle nut had one for years, actually! Listing torque as 40 in-lb +-2.5 instead of ft-lb! Or, maybe the rear diff is not meant to be filled that high? Fluid dynamics in a diff is cool...

  2. #17
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    Quote Originally Posted by erhayes View Post
    Some vehicles have a normal full mark and a HOT full mark. Oil expands with increasing temp. This discussion has reached a low point for me. Ed
    My Z06 would vary significantly based on oil temp, and even gave temp parameters for properly checking it.

  3. #18
    Registered Member 7eregrine's Avatar

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    Quote Originally Posted by erhayes View Post
    Some vehicles have a normal full mark and a HOT full mark. Oil expands with increasing temp. This discussion has reached a low point for me. Ed
    [emoji106]

  4. #19
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    The dipstick need not come into the equation when filling the engine after an oil change, only at routine inspections thereafter. Just like the factory, it will not be used when adding a metered amount of oil and it will be exact. Every engine that leaves the factory will have the same amount of oil reaching the exact same point on the dipstick which is also precisely the same on every engine - dipsticks and the indicated amount which for the diesel is lower than the full mark, do not vary. I have read on this forum several times that owners have grumbled about fluid levels being *low* on post delivery vehicles. The only time I might expect there to be slight variations would be with coolant where air might not be purged until after a period of running despite have also been filled with a precise amount. My point about Spotty Eric is that it will not normally be one of the technicians doing the pre delivery inspection but a semi skilled guy who working to what he knows best, might top off the oil. I did it the first time I changed my oil after coming from a Toyota which does not dilute. Since realising the issues, I don*t even bother breaking into the sixth litre to get 5.1 litres as 0.1 litre is only an *eyeful* and is on the right side. I can report that 6 full litres takes it right to the full mark which would instinctively feel normal to most of us. A question for you guys with the 2.5G engine. Do you have an X mark above the full line like the diesels do?

  5. #20
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    I think the CX-5 had a smaller oil pan in the past and Mazda did not update the manual when they came out with the larger oil pan. My 2018 takes almost 5.5 quarts.

  6. #21
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    Quote Originally Posted by Unobtanium View Post
    Dip-sticks are imprecise. I've found variance on all vehicles vs stated capacity.
    I have been changing oil of my vehicles since the first one many years ago. The CX-5 is the first vehicle I've owned and many other vehicles from friends and family that the stated oil capacity does not match the Full mark of the dipstick.

    Rear diff may be a typo in the manual.
    No, this definitely is not the typo. Mazda has revised the gear oil capacity on rear differential to 0.37 US quarts (from 0.45 quarts) on gen-2 CX-5 AWD. You'd believe Mazda should have known the error of typo on gen-1 CX-5 and issued a revision at least on factory service manual? Besides, everyone here who checked the gear oil level of rear differential from factory has found it's low. I believe Mazda preset the factory-fill to 0.45 / 0.37 quarts for rear differential. But then why the factory service manual states refill the gear oil to the fill-hole, which would be ~ 0.8 quarts, way more than factory specified 0.45 / 0.37 quarts?

    The same on engine oil. Owner's manual says top off the oil to the Full mark when oil level is low, which means the oil capacity should be ~5.4 quarts instead of specified 4.8 quarts on 2.5L NA.

    It's all of these inconsistencies and discrepancies by Mazda which makes me feel like unprofessional.

    And why Mazda wants to be different from everybody else on capacities and measurements?

  7. #22
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    Quote Originally Posted by MyFirstMazda View Post
    I think the CX-5 had a smaller oil pan in the past and Mazda did not update the manual when they came out with the larger oil pan. My 2018 takes almost 5.5 quarts.
    A good possibility. I had my oil pan replaced recently and the new one takes more oil to get to the full mark.

  8. #23
    Registered Member yrwei52's Avatar
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    Quote Originally Posted by MyFirstMazda View Post
    I think the CX-5 had a smaller oil pan in the past and Mazda did not update the manual when they came out with the larger oil pan. My 2018 takes almost 5.5 quarts.
    So Mazda updated the rear differential gear oil capacity, air pressure on 19" tire, but forgot to revise the oil capacity for 3 model years?

    Very sloppy job nevertheless by Mazda!

    My 2016 CX-5 has original presumably "smaller" oil pan, it'd still take ~5.4 quarts to reach the Full mark on dipstick, not the specified 4.8 quarts.

  9. #24
    Registered Member yrwei52's Avatar
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    Arrow GT-R oil overfilled

    Quote Originally Posted by erhayes View Post
    Some vehicles have a normal full mark and a HOT full mark. Oil expands with increasing temp. This discussion has reached a low point for me. Ed
    The oil level measurement is all based on the same stated procedure, hence oil expansion issue is irrelevant, as oil measured should be close to the same temperature.

    Besides, when we buy a jug of engine oil, the quantity specified on it would not say 1 quart or 5 quarts “approximately” like Mazda did, would it?
    Last edited by yrwei52; 03-11-2019 at 11:50 AM.

  10. #25
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    Arrow GT-R oil overfilled

    Quote Originally Posted by Anchorman View Post
    The dipstick need not come into the equation when filling the engine after an oil change, only at routine inspections thereafter. Just like the factory, it will not be used when adding a metered amount of oil and it will be exact. Every engine that leaves the factory will have the same amount of oil reaching the exact same point on the dipstick which is also precisely the same on every engine - dipsticks and the indicated amount which for the diesel is lower than the full mark, do not vary. I have read on this forum several times that owners have grumbled about fluid levels being *low* on post delivery vehicles. The only time I might expect there to be slight variations would be with coolant where air might not be purged until after a period of running despite have also been filled with a precise amount.
    Yes, been working on the automobile assembly line before I do understand every fluid level in every new vehicle should be the same measured precisely by the computer. The Full mark on dipstick is designed to match the oil capacity decided by engineers. If Mazda engineers believe 4.8 quarts is the best oil capacity for SkyActiv-G 2.5L NA and used that amount to every such engine during factory fill, then the Full mark on dipstick should be consistent at proper location for 4.8 quarts, not 5.4 quarts like the current location.

    My point about Spotty Eric is that it will not normally be one of the technicians doing the pre delivery inspection but a semi skilled guy who working to what he knows best, might top off the oil. I did it the first time I changed my oil after coming from a Toyota which does not dilute. Since realising the issues, I don*t even bother breaking into the sixth litre to get 5.1 litres as 0.1 litre is only an *eyeful* and is on the right side. I can report that 6 full litres takes it right to the full mark which would instinctively feel normal to most of us.
    Sounded like the higher-than-specified-capacity Full mark on our CX-5's dipstick is to cover the oil dilution / rising issue?

    A question for you guys with the 2.5G engine. Do you have an X mark above the full line like the diesels do?
    No, the dipstick on our SkyActiv-G has only 2 dots, indicating Full and Add marks, or Max and Min marks. I understand on SkyActiv-D 2.2L diesel, the dipstick used to have 2 dots too. The higher "X" mark was added afterwards to "fix" the oil dilution issue on diesel, trying to ease the worries from those diesel owners when oil level is rising.

  11. #26
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    Quote Originally Posted by yrwei52 View Post
    Yes, been working on the automobile assembly line before I do understand every fluid level in every new vehicle should be the same measured precisely by the computer. The Full mark on dipstick is designed to match the oil capacity decided by engineers. If Mazda engineers believe 4.8 quarts is the best oil capacity for SkyActiv-G 2.5L NA and used that amount to every such engine during factory fill, then the Full mark on dipstick should be consistent at proper location for 4.8 quarts, not 5.4 quarts like the current location.
    It's a design choice. Clearly its a case of the oil level is considered within acceptable parameters as long as the level is between the two holes on the dipstick. I understand your want of precision, but in this case, does it really change anything? It's why many of us who DIY consider a 5 qt. jug of oil acceptable. Somehow if I had to guess, you buy a 6th quart and get to the top hole don't you?

    Now the more egregious lack of precision is definitely with the ATF and other fluids you mentioned, like the rear differential. My ATF was likewise underfilled, and I had to add additional fluid when I drain/filled mine to reach the correct level marked on the ATF dipstick at the proper temperature, which unlike the engine oil dipstick, is much more precise in acceptable fluid level.

    Sounded like the higher-than-specified-capacity Full mark on our CX-5's dipstick is to cover the oil dilution / rising issue?
    Would be concerning if true, but I imagine perhaps some CX-9 owners could weigh in on if they have had such issues?
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  12. #27
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    This thread is just calling for a corksport dipstick aftermarket Mod.

  13. #28
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    Quote Originally Posted by Turborascal View Post
    I just checked my Sig with 1k miles on the clock after it sat in the garage overnight.
    Oil level is nearly 1/4" over full; but I'm unconcerned for 2 reasons:

    (1) I checked it while cold after sitting overnight. The manual states:

    1. Be sure the vehicle is on a level surface.
    2. Warm up the engine to normal operating temperature.
    3. Turn it off and wait at least 5 minutes for the oil to return to the oil pan.
    4. Pull out the dipstick, wipe it clean, and reinsert it fully.
    5. Pull it out again and examine the level.
    6. The level is normal if it is between the MIN and MAX marks.
    7. If it is near or below MIN, add enough oil to bring the level to MAX.
    8. Make sure the O-ring on the dipstick is positioned properly before reinserting the dipstick.
    9. Reinsert the dipstick fully.


    (2) Slightly overfull should be well within tolerance of what the engine can handle.
    It's only when severely overfull that the engine crank can whip air into the oil and lead to lubrication problems.

    Bottom line for me; no big deal.
    Thanks for chiming in with what you’re seeing on your signature.

    I agree, I doubt it’s anything to be concerned about. I was mostly curious to see what other folks are seeing with the factory fill on a 2.5T.

  14. #29
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    Quote Originally Posted by yrwei52 View Post
    The oil level measurement is all based on the same stated procedure, hence oil expansion issue is irrelevant, as oil measured should be close to the same temperature.

    Besides, when we buy a jug of engine oil, the quantity specified on it would not say 1 quart or 5 quarts *approximately* like Mazda did, would it?
    I agree with you, the dipstick has a full mark and a low mark. When the crankcase is full it should be at the full mark. My car actually was at the full mark when I got it new so that is what I am going to keep doing. It sort of sucks buying the 5 quart jug and one extra quart too but that is what I want to do. The extra quart is good for two oil changes so it's not that bad.

  15. #30
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    Quote Originally Posted by MyFirstMazda View Post
    I agree with you, the dipstick has a full mark and a low mark. When the crankcase is full it should be at the full mark. My car actually was at the full mark when I got it new so that is what I am going to keep doing. It sort of sucks buying the 5 quart jug and one extra quart too but that is what I want to do. The extra quart is good for two oil changes so it's not that bad.
    Your choice. 5 qt. jug does fine.
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