My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
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Can I use 75w instead 70w gear oil?
- Thread starter Polyalphaolefin
- Start date
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
It's not cheap, but it's 70W:
![[Linked Image]](https://www.bobistheoilguy.com/forums/attachments/usergals/2020/02/full-55499-41755-20200228_121138.jpg "[Linked Image]")
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
It's not cheap, but it's 70W:
Highly rec. NOT exceeding mfr's rec'd SAE weight recommendation. Do you REALLY want gravelly-feeling shifts particularly when cold? That might happen.
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Necessary cold weather performance depends upon your ambient operating temperature.
There are plenty of 70W or 70W-75W dual rated products out there you'll probably have to buy it online since it's a European vehicle I don't know what retailer to recommend since I'm stateside , if it specs a GL-4 lube don't use a GL-5 gear lube as it can cause damage to brass parts.
Here's a 70W MTL:
https://www.redlineoil.com/mt-lv-70w75w
Does Kia not offer a fluid that meets their own specs? That occasionally happens.
https://www.redlineoil.com/mt-lv-70w75w
Does Kia not offer a fluid that meets their own specs? That occasionally happens.
I just went through this fiasco wondering why I couldn't use 75w90 gear oil vs the 75w80 my manual tranny calls for. Molakule should chime in here but you really need to stay with a GL4. I ended up buying redline MTL which is a 75w80 and is made for manual transmissions.
I forgot to note: I live in Europe (Bosnia). Cant find any 70w here. not even in dealership!
Is there any place you can order liquimoly Top Tec MTF 5300 70W-75W
Totally agree. 70W is a range of viscosities... and even there are wide differences in the 40 degree C behaviours... and in the Brookfield Viscosity behaviours, and in the Viscosity Indexes... all within the same basic SAE oil "weight".
Yep and this is what I have in my Corolla.
![[Linked Image]](https://www.bobistheoilguy.com/forums/attachments/usergals/2020/02/full-31470-41756-amsoil.jpg "[Linked Image]")
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
I don't think '5W' is really going to make that much cold difference where the OP lives.
Originally Posted by zeng
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
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Originally Posted by Cdn17Sport6MT
Originally Posted by zeng
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
I understand where are you coming from on the bold but IMO the rational/logic is invalid .......
until and unless OEM's (Kia or Mazda) specifically prohibits use of 75W grade in lieu of recommended 70W, in which case I interpret the prohibition as arises out of OEM design defects/faults .
Btw, manual trans lubrication systems are typically of oil bath/splash design .
Originally Posted by zeng
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
I understand where are you coming from on the bold but IMO the rational/logic is invalid .......
until and unless OEM's (Kia or Mazda) specifically prohibits use of 75W grade in lieu of recommended 70W, in which case I interpret the prohibition as arises out of OEM design defects/faults .
Btw, manual trans lubrication systems are typically of oil bath/splash design .
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![[Linked Image]](https://www.bobistheoilguy.com/forums/attachments/usergals/2020/02/full-86268-41780-0_02_05_79252136fc7070a136c8882a7b8070d8ce6e53763412922cd3a006d37ff6f344_c7e12e5c.jpg "[Linked Image]")
OK, I bought Comma 75w MTF. Will be changing it soon.
Originally Posted by zeng
Originally Posted by Cdn17Sport6MT
Originally Posted by zeng
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
I understand where are you coming from on the bold but IMO the rational/logic is invalid .......
until and unless OEM's (Kia or Mazda) specifically prohibits use of 75W grade in lieu of recommended 70W, in which case I interpret the prohibition as arises out of OEM design defects/faults .
Btw, manual trans lubrication systems are typically of oil bath/splash design .
Zeng, I'm not sure I follow your logic on why, if the Mfr specs 70W and does not specifically prohibit the use of 75W, you feel you have leave to use the higher SAE "weight" product.
As for shaft oil funnels, I have attached a couple of graphics. Yes, in most cases the lubrication for a manual transmission or transaxle is by splash... but specifically per the photos - in many Ford- or Ford-inspired transmissions/transaxles there also is a trough arrangement whereby oil splash feeds the trough, or "spent oil" from a higher-up shaft feeds the trough... and then the oil funnel directs the oil under a gravity feed arrangement along the shaft, and out the radially-drilled oil-feed holes (in this case, to the speed-gears). (The photos are for a Non-World-Class - NWC - Borg Warner T5. I guess this is not a Ford design, per se... but...). On the somewhat "poorboy" Mazda set-up the speed-gear journals comprise non-sharp-edged splines, and between spine-ribs the oil feed holes are in place to lubricate the speed-gears.
Higher viscosity manual transmission lubricant has a harder time making it along the shafting and out the journal oil-feed holes (i.e. lower flow rate). That is why in the case of the Mazda C66M-R transaxle I would not exceed the Mfr's 75W-80 recommendation. If the OP's car has this same design for the speed-gears (I have no idea, on that account) then I believe my logic stands for the Mfr's specification of 70W MTL.
Originally Posted by Cdn17Sport6MT
Originally Posted by zeng
Originally Posted by Polyalphaolefin
My KIA Ceed recoomends for manual transmission oil: 70W API GL-4. I cant find nowhere 70w oil, so can I use 75w oil (api GL4) instead?
Yes, you can and you get stronger oil film for components protection .
But you might have higher tendency of encountering morning cold shift harshness ,depending on your locality .
The C66M-R transaxle in my Mazda (yes, I know - it's a different Mfr) has trough/shaft funnel/drilled shafts to feed lubricant to the speed-gears which run on splined journals. In my case I am unwilling to potentially feed less lubricant to the speed-gears using higher viscosity lubricant. Yes, film strength is higher with a higher viscosity lubricant but this lubricant flow matter is at hand... Not sure what the arrangement is for the car at issue... but I'm just saying...
I understand where are you coming from on the bold but IMO the rational/logic is invalid .......
until and unless OEM's (Kia or Mazda) specifically prohibits use of 75W grade in lieu of recommended 70W, in which case I interpret the prohibition as arises out of OEM design defects/faults .
Btw, manual trans lubrication systems are typically of oil bath/splash design .
Zeng, I'm not sure I follow your logic on why, if the Mfr specs 70W and does not specifically prohibit the use of 75W, you feel you have leave to use the higher SAE "weight" product.
As for shaft oil funnels, I have attached a couple of graphics. Yes, in most cases the lubrication for a manual transmission or transaxle is by splash... but specifically per the photos - in many Ford- or Ford-inspired transmissions/transaxles there also is a trough arrangement whereby oil splash feeds the trough, or "spent oil" from a higher-up shaft feeds the trough... and then the oil funnel directs the oil under a gravity feed arrangement along the shaft, and out the radially-drilled oil-feed holes (in this case, to the speed-gears). (The photos are for a Non-World-Class - NWC - Borg Warner T5. I guess this is not a Ford design, per se... but...). On the somewhat "poorboy" Mazda set-up the speed-gear journals comprise non-sharp-edged splines, and between spine-ribs the oil feed holes are in place to lubricate the speed-gears.
Higher viscosity manual transmission lubricant has a harder time making it along the shafting and out the journal oil-feed holes (i.e. lower flow rate). That is why in the case of the Mazda C66M-R transaxle I would not exceed the Mfr's 75W-80 recommendation. If the OP's car has this same design for the speed-gears (I have no idea, on that account) then I believe my logic stands for the Mfr's specification of 70W MTL.
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