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I am a former AMSOil dealer, so I'm quite familiar with their products. Sales garbage aside, I strictly focus on the technical data.

Pennzoil Ultra Platinum is a great oil, I fully agree on that. The fact that their HTHS results are not published makes me really uneasy. Though, I've just verified that the Pennzoil Ultra Platinum 5w30 that I'm running at the moment is ILSAC GF-6a compliant - meaning the HTHS must be at least 2.9.


AMSOil does publish their HTHS results for 5w30 and 10w30, and they're better than the ILSAC GF-6a requirements at 3.11 - 2.9 is the requirement.

ILSAC GF-6b is what the GTS16E-GTS engine was designed around, and I refuse to put oil that thin into that engine. That HTHS is 2.67... No thanks. The requirement is 2.3.


Aside from that, this video demonstrates the importance of HTHS.


AMSOil 0w30 has a high NOACK loss of 8.8%.

I still maintain that 10w30 is the best balance of all.


Ok, I'm rambling and need to sleep.
IS There such thing as 20w30 and would it be better ??:ROFLMAO:

i'm thinking of going thicker, 10w30 sounds nice but which brand do you recommend? i change my oil every 2500 according to the GT-R engineer lol

right now im at 5w30 but im afraid it's not enough who knows
 
IS There such thing as 20w30 and would it be better ??:ROFLMAO:

i'm thinking of going thicker, 10w30 sounds nice but which brand do you recommend? i change my oil every 2500 according to the GT-R engineer lol

right now im at 5w30 but im afraid it's not enough who knows
I've never seen a 20w30. 10w30 is the closest that I've seen. I'm on the fence about switching to a 0w40, but I need to do more reading before I make that move.

As per brand of oils, I have 2 that I'm comfortable with.

If I need it within 3 days or fewer and my budget is tight, I'll go with Pennzoil Ultra Platinum. If my budget allows, I will order AMSOil Signature Series around 1 week prior to when I'm going to change the oil.

I would say that the oil filter is equally important to the oil used. I will go out of my way to pre-order the Fram Synthetic Endurance filter (it appears to be a Walmart exclusive). If I cannot get that, then I'll get the Fram Ultra Synthetic.

Until I see factual results that demonstrates there is a better filter than either of those, then I won't be changing, and I would never use the Toyota OEM filter as the last result that I've seen had it at being pretty poor comparatively.
 
my dealer gave me free oil changes for life. first two, 5k and 10k were covered by Toyota themselves, after that, it's the dealer. so 15k happened this morning. they did the oil change without question, but I went to get the keys, and they said I owed, I was ready for them, but when they called the service manager, he ok'd it without me needing to pull out the service manual.

so the cashiers didn't know, but everyone else did. no big deal.
That's a pretty sweet deal. Was that just offered because you bought a GRC, or do they do that for other customers, or you're a repeat buyer...?
 
That's a pretty sweet deal. Was that just offered because you bought a GRC, or do they do that for other customers, or you're a repeat buyer...?
they do that for anyone that buys there, it's just LOF and rotate. but that's like $300 a year in maintenance. of course, they hit you with a list of recommended maintenance every time you go, and sorry for them, I can/will be replacing my own air filter, brake pads, accessory belt. they'll be happy to know I'll let them do the diffs and trans fluids though.

anyway, I'm sure it brings in business for the service team.
 
my dealer gave me free oil changes for life. first two, 5k and 10k were covered by Toyota themselves, after that, it's the dealer. so 15k happened this morning. they did the oil change without question, but I went to get the keys, and they said I owed, I was ready for them, but when they called the service manager, he ok'd it without me needing to pull out the service manual.

so the cashiers didn't know, but everyone else did. no big deal.
Toyotacare covers the first 5 on the GRC anyway so it wouldn't matter.
 
Did my first dealer oil change that was covered by the Toyota Extended Care Protection plan. Thankfully the service advisor saw my appointment booking note about the GR Corolla's service intervals recommending oil changes as part of Service #1 and confirmed it on his end, so I didn't have to fight for an oil change.

According to the invoice, the oil they used was c0bba-0w2sn-0b GF5, which I'm guessing is the bulk TGMO synthetic 0W20 they have. No idea if they actually put in old GF5 rated oil or if they just haven't updated the description in their system for the new GF6A rating. But so far no issues after a few days.

Are there any recent published specs on the c0bba-0w2sn oil? Particularly the viscosity at 100C (in cSt).
 
Has anyone used motul for the diff, transfer case, and trans? I have a lot of gear 300 75w90 and motylgear 75w80 I use for my other car and it would make things a lot easier if I could use the same thing on the grc. It seems to be compatible based on specs. Any experience?
 
Has anyone used motul for the diff, transfer case, and trans? I have a lot of gear 300 75w90 and motylgear 75w80 I use for my other car and it would make things a lot easier if I could use the same thing on the grc. It seems to be compatible based on specs. Any experience?
Admittedly, I have not. I did use AMSOil Severe Gear 75w90 for the gearbox, front & rear diffs - which is both GL-4 and GL-5 compatible and I've had no issues with 1400+ miles on the fluid.

The 2 gear oils that you've detailed are both GL-4 and GL-5 compatible, so you're good to go.
 
Admittedly, I have not. I did use AMSOil Severe Gear 75w90 for the gearbox, front & rear diffs - which is both GL-4 and GL-5 compatible and I've had no issues with 1400+ miles on the fluid.

The 2 gear oils that you've detailed are both GL-4 and GL-5 compatible, so you're good to go.
Motul seems to meet specifications, but was just a bit worried since nobody brought it up.
 
Motul seems to meet specifications, but was just a bit worried since nobody brought it up.
I get where you're coming from. And that is the point of standards like GL-4 and GL-5. It allows those of us that read on those details to know that the product we have (gear oil) has met the standards for the other products we have (gear box, diffs).

If it were not for that, I 100% understand the concern/worry of potential damage.
 
Has anyone used motul for the diff, transfer case, and trans? I have a lot of gear 300 75w90 and motylgear 75w80 I use for my other car and it would make things a lot easier if I could use the same thing on the grc. It seems to be compatible based on specs. Any experience?
I have never used it although I don't think it would be an issue. I've always used Redline gear oil and I love it. I also like that it's the exact spec for it at 75w-85 and a GL5. I've never been sure about a gear oil that says it's a GL4 and a GL5 as they are generally different and in many cases can't be used interchangeably.
 
Anyone run the Redline MTL transmission fluid yet? Seems that everyone runs the MT-LV. MTL also meets the GL-4 requirement and it meet the 75w requirement. I am running the MT-LV at the moment but the stuff seems thin for trans/gear oil (I know LV is for low viscosity). I notice a lot of people tend to run 5w-30 oil on track and for high performance driving, but I haven't seen people step up transmission fluid to a thicker fluid for the same thing. I am wondering if there is a specific reason know one has posted about running the MTL fluid.
 
For anyone that’s wondering if the transfer case and rear differential would be super black after changing it again for the second time it’s not. So doing the break in flush is very important.

here’s a photo of how the oil looks after 10k km. It’s pretty clean. The original flush was completely black.
Image
 
Anyone run the Redline MTL transmission fluid yet? Seems that everyone runs the MT-LV. MTL also meets the GL-4 requirement and it meet the 75w requirement. I am running the MT-LV at the moment but the stuff seems thin for trans/gear oil (I know LV is for low viscosity). I notice a lot of people tend to run 5w-30 oil on track and for high performance driving, but I haven't seen people step up transmission fluid to a thicker fluid for the same thing. I am wondering if there is a specific reason know one has posted about running the MTL fluid.
I never even looked into the MTL since it calls for the MT-LV. I've run MT-LV on my 2009 Corolla Turbo S 5-speed and it still shifts like butter after almost 16 years and over 132k miles. I also run it in my 2017 Corolla iM 6MT and mow my 23 GRC. It's great stuff.
Image
 
I had posted this on another page, but turns out there's already a maintenance sub. Here's every fluid info on the entire car.

All part numbers for services and technical tidbits:

Oil filter (factory fit - only available in Japan) : 90915-10009
Oil filter (North America equivalent) : 90915-YZZM1 = 90915-YZZF2 = 90915-YZZN1 - all three supercede to the newest N1, some dealers may still have old stock as this is not a fast mover.
Oil filter (unconfirmed alternative bigger filter): 90915-YZZF1 - this is a common upgrade for 4A-GE's. Stock 4A-GE filter is the YZZF2 filter, but YZZF1 fits, longer by about 1cm = more filtering. Only limitation is fitment of the longer filter.

Drain plug gasket for engine: 90430-12031 - M12 double teflon coated aluminum
Rear diff drain and fill gaskets: 12157-10010 x2 - M18 ring/donut type
Transfer drain and fill gaskets: 12157-10010 x2
Transmission drain and fill gaskets: 90430-18008 or 90430-A0003 x2 - M18 aluminum flat
For what its worth, both Rear and Transfer drain plugs are magnet equipped. Both are 90341-18051, no need to replace every service.

Transmission oil: 08885-81007 x2 Toyota LV (w/LSD is 2L, but w/o LSD takes 2.1L, so might need more than 2)
Rear diff oil: 08885-02606 Toyota LX (half ish liter)
Transfer oil: 08885-02506 Toyota LT (half ish liter)

Oil (factory fill): 08880-13205 (4L can, you need more than one, spec is 4.3L with filter change)
Oil (Canada): C0BBA-0W2SN-1J (4.4L, API SP, which matches the ILSAC GF-6A req: Oil Categories)
Oil (USA): 00279-0WQTE-6S (per quart) - this part number was also used for API SN Plus, but it should now be all API SP. Back of the bottle says if it is.
View attachment 6043


Here's the full service specs from Toyota docs:

SERVICE DATA
Brake Fluid (for Gasoline Model)
for G16E-GTS"TOYOTA GENUINE BRAKE FLUID DOT4, CLASS6", FMVSS No.116 DOT4 or SAE J1704LV
*: If a fluid type with "TOYOTA GENUINE BRAKE FLUID DOT4, CLASS6", FMVSS No.116 DOT4 or SAE J1704LV is not available, fluid type with TOYOTA GENUINE BRAKE FLUID DOT3, FMVSS No.116 DOT3 or SAE J1703 may be used with no detriment to brake durability.
except G16E-GTS
  • SAE J1703 or FMVSS No. 116 DOT3
  • SAE J1704 or FMVSS No. 116 DOT4
EA67F/EA68F Manual Transaxle Oil
Standard Capacityw/ LSD
2.0 liters (2.1 US qts, 1.8 Imp. qts)
Toyota Genuine Manual Transmission Gear Oil "LV GL-4 and SAE 75W" or "API GL-4 and SAE 75W"
w/o LSD
2.1 liters (2.2 US qts, 1.8 Imp. qts)
G16E-GTS Coolant
CAPACITYCLASSIFICATION
5.7 liters (6.0 US qts, 5.0 Imp. qts)TOYOTA vehicles are filled with TOYOTA SLLC at the factory. In order to avoid damaging the engine cooling system and other technical problems, only use TOYOTA SLLC or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, non-borate coolant with long-life hybrid organic acid technology (coolant with long-life hybrid organic acid technology is a combination of low phosphates and organic acids).

G16E-GTS Standard Engine Oil Grade
OIL GRADEOIL VISCOSITY (SAE)
ILSAC GF-6A multigrade engine oil
  • 0W-20
G16E-GTS Engine Oil Standard Capacity
ITEMSTANDARD CONDITION
Drain and refill with oil filter change4.3 liters (4.5 US qts, 3.7 Imp. qts)
Drain and refill without oil filter change4.0 liters (4.2 US qts, 3.5 Imp. qts)
Dry fill5.1 liters (5.4 US qts, 4.5 Imp. qts)

GF1A Transfer Oil
OIL GRADEVISCOSITYSTANDARD CAPACITY
Toyota genuine differential gear oil LT API GL-5 or equivalentSAE 75W-850.40 to 0.50 liters (0.43 to 0.52 US qts, 0.36 to 0.44 Imp.qts)
Differential Oil
ďż˝
OIL GRADESTANDARD CAPACITY
*: Using differential gear oil other than the specified oil may cause abnormal noise orvibration, or damage the differential gear of your vehicle.
Toyota Genuine Differential gear oil LX 75W-85 GL-5 or equivalent*0.45 to 0.55 liters (0.48 to 0.58 US qts, 0.40 to 0.48 Imp. qts.)
What is the correct one for transmission gear oil? I saw someone else posted 08885-81001
 
Toyota states: 75w85

I am running 75w90 with no issues.
Amsoil even recommends their 75w90 as a replacement for 75w85. The difference is virtually negligible as far as the actual viscosity is concerned. Unless the car is strictly a low stress mile muncher, I'd never recommend someone use lighter weight viscosities, OE recommended is bare minimum for me.
 
Amsoil even recommends their 75w90 as a replacement for 75w85. The difference is virtually negligible as far as the actual viscosity is concerned. Unless the car is strictly a low stress mile muncher, I'd never recommend someone use lighter weight viscosities, OE recommended is bare minimum for me.
I'm going to run 75w110 next time I change out the fluid. I want the extra protection that the 110 offers over 90 when the gearbox, transfer case and rear diff all get hot.
 
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