knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Fri May 21, 2021 8:15 am

I've got over +4k miles on my gear oil change, no issues (well at least nothing I can hear) yet. I plan on changing it next month since I've already put it through plenty of abuse with my lead foot driving and several +600 mile trips now on the vehicle. :)
I am curious to see if the next oil analysis shows anything to worry about. :mrgreen:
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

estomax
Posts: 313
Joined: Fri Jan 20, 2017 9:23 pm
Delivery Date: 21 Jan 2017
Leaf Number: 424033
Location: Seattle

Re: Reduction Gear Oil Change - Benefits for Range

Tue May 25, 2021 8:38 pm

so to put in a data point - running 75w90 for the last week and few hundred miles, and my average is at 3.9, which is what it was with the low viscosity gear oil. This is telling me that the temperature switch from colder to warmer did the large majority of the efficiency gains and gear oil really seems to have very little effect. Granted this is not many thousands of miles of data but it's enough to not be a total fluke, and the 75w90 is many times thicker than the ATF the Leaf usually uses.
2013 Leaf SL
27k, 93% SoH 2/17 46k, 94% SoH 2/18
62k, 87% SoH 2/19 75k, 83% SoH 2/20
81k, 81% SoH 2/21

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Tue May 25, 2021 10:10 pm

It's good to know. Good science is about accepting the data and less about hoping for the data :lol:
I'm about to try the same thing, going to swap back in the Nissan Matic S, send the old gear oil in for analysis (to see if it was causing gearbox damage for example) as I have nearly +5k Miles on it now.

I've been able to narrow down my extra efficiency boost to tire pressure when the temperature was climbing this month on top of the boost I got from my gear oil change. The temperature efficiency boost has no effect on the high speed driving, but does have an effect on the lower (under 55 mph) type of driving. Probably just rolling resistance related, I can feel it in the vehicle handling, the tires being inflated to 48 PSI when hot are real bouncy. :shock:

I've lowered the tire pressure this week to 40 PSI (in ambient 72F temperature) so that when the day gets hot, they top out at 44 PSI to try to eliminate that low speed boost I'm seeing. It's a slow process keeping track of all this data and I wish I had a way to monitor the gear oil temperature real-time or LeafSpy like, but don't have the time or resources to drill a temperature probe into the gear box. Of course my conclusions are not finished yet, but if I had to take an educated guess based on the data I have, I would say using the ULV gear oil seems to negate the mileage loss using the AC/Heat during a trip. The effect seems to show itself more when the temperature is colder and then slowly decrease as the temperature gets warmer. I suspect it is something more thermal related in the system as a whole and the benefit of the ULV is more about it's lower viscosity at colder temperatures than how well it keeps the gears lubricated. It could also be that just changing out the gear oil period is the key, regardless of what type of you choose, you will see a benefit. Maybe it's not so much a gain of efficiency but a return to the "original" efficiency when the vehicle was brand new from the factory. I think I learn more towards that than anything, but I don't have a brand new 2021 Leaf with 0 miles on the odometer to test with, unless someone wants to send me one? :mrgreen:
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Fri May 28, 2021 12:20 am

I'm going to find a way to start recording my gear oil temperature to add to the pile of data. I want to get some good readings with trips and efficiency so that when I make the switch back to Nissan Matic S, should the efficiency actually change, I want to know if the gear box temperature is changing as well. Just making a note here for future reference.
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Tue Jun 01, 2021 3:53 pm

The Nissan Matic S finally came in today. Now I can prepare for the reduction gear oil change back to "factory" standard. Once I get the temperature sensors installed for the gear oil and coolant (had an extra sensor, why not?), I can start recording what the ULV is doing temperature wise and then when I put the factory oil back in, I can see what difference (if any) it makes for both efficiency and operating temperature.

Image
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Fri Jun 04, 2021 11:44 am

Temperature probe bolt for reduction gear oil complete. Move on to Level 3...

Image
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

estomax
Posts: 313
Joined: Fri Jan 20, 2017 9:23 pm
Delivery Date: 21 Jan 2017
Leaf Number: 424033
Location: Seattle

Re: Reduction Gear Oil Change - Benefits for Range

Fri Jun 04, 2021 1:05 pm

are you putting this in the fill hole? will you have it pointed down into the oil or i suppose air in the gearbox will be much the same temperature as the oil?
2013 Leaf SL
27k, 93% SoH 2/17 46k, 94% SoH 2/18
62k, 87% SoH 2/19 75k, 83% SoH 2/20
81k, 81% SoH 2/21

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Fri Jun 04, 2021 1:12 pm

Ok, first readings today. Drove around for about half an hour in 85F Sunny temperatures, high humidity :?
The coolant and gear oil temperature started at 90F so I had do a lot of stomp the pedal acceleration to heat up the gear oil because casual stop and go driving was never getting it above 120F :lol:

First interesting thing I noticed, the coolant temperature (Probe 2) never gets over 100F. Another interesting thing, as the temperature of the gear oil increases past 140F (Probe 1), then coolant temperature starts to rise up to +100F (cooling motor and stuff my guess) until gear oil temperature gets below 140F and then coolant temperature starts to gradually decrease from air cooling.

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Last edited by knightmb on Fri Jun 04, 2021 6:47 pm, edited 1 time in total.
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

knightmb
Posts: 970
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Reduction Gear Oil Change - Benefits for Range

Fri Jun 04, 2021 1:16 pm

estomax wrote:
Fri Jun 04, 2021 1:05 pm
are you putting this in the fill hole? will you have it pointed down into the oil or i suppose air in the gearbox will be much the same temperature as the oil?
I'm using the fill hole on top, probe is pointed straight down into the gear oil. I made sure it wouldn't touch any gears and locked it into place with some straps and sealed the hole around probe with liquid electrical tape even though drill hole and probe are already a tight seal. I didn't want any water to get in, but at the same time, this isn't permanent. It should hold for a few weeks so I can run some before and after test.

After my first test today, no leaks (thank goodness) :lol:
2020 Leaf SL Plus - (Manufacture Date March 2020)
2013 Leaf SV (8 faithful years of service before trade in at 75,679 miles)
Timekoin - The World's Most Energy Efficient Encrypted Digital Currency

SageBrush
Forum Supporter
Posts: 6370
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: Reduction Gear Oil Change - Benefits for Range

Fri Jun 04, 2021 4:51 pm

This is interesting data. Thanks for sharing
2013 LEAF 'S' Model with QC & rear-view camera
Bought Jan 2017 from N. California
Two years in Colorado, now in NM
03/18: 58 Ahr, 28k miles
11/18: 56.16 Ahr, 30k miles
09/20: 54.3 Ahr; 38k miles
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2018 Tesla Model 3 LR, Delivered 6/2018

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