Until I started buying Ow20, Mobil 1 75 90 was the only synthetic lube I've ever used. It has friction modifiers that stopped the chuckling in my 528e's LSD.
Cost-no-object 75W-90 GL-5 for a differential?
- Thread starter d00df00d
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Years ago, I used Valvoline 75W-90 synthetic in lieu of straight 75 (recommended by Saab) ..50,000 miles of easy shifting, no noise .. . '79 900 .
WATCH the GL # , I think one # is for limited slip differentials only .
WATCH the GL # , I think one # is for limited slip differentials only .
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Originally Posted By: zeng
Lucas 75W90 GL5 for its high KV40*C of 142 cSt.
Why would this be a benefit?
Lucas 75W90 GL5 for its high KV40*C of 142 cSt.
Why would this be a benefit?
Originally Posted By: rooflessVW
Originally Posted By: d00df00d
Originally Posted By: rooflessVW
Mobil Delvac.
Major label, known high quality - probably seen more use and abuse than most any other gear oil.
Impressive list of certs, too.
Would you really take it over, say, Motul Gear 300? That oil has pretty good provenance in its own right, and its VI and KV40 are in a completely different league.
Personally I would - it is a race-provrn lubricant in Porsche transaxles.
Just did a bit more reading on the Delvac. Seems like some people who use it in Porsche transaxles complain about poor shifting when cold, even in moderate ambient temps. No such issues with Gear 300.
Part of me feels like there has to be something with comparable cred to the Delvac, and better cold viscometrics. But man, Delvac's cert/spec list is LONG. Maybe the answer to this thread is Delvac for warm/hot climates or track use, and something else otherwise...
Originally Posted By: d00df00d
Originally Posted By: rooflessVW
Mobil Delvac.
Major label, known high quality - probably seen more use and abuse than most any other gear oil.
Impressive list of certs, too.
Would you really take it over, say, Motul Gear 300? That oil has pretty good provenance in its own right, and its VI and KV40 are in a completely different league.
Personally I would - it is a race-provrn lubricant in Porsche transaxles.
Just did a bit more reading on the Delvac. Seems like some people who use it in Porsche transaxles complain about poor shifting when cold, even in moderate ambient temps. No such issues with Gear 300.
Part of me feels like there has to be something with comparable cred to the Delvac, and better cold viscometrics. But man, Delvac's cert/spec list is LONG. Maybe the answer to this thread is Delvac for warm/hot climates or track use, and something else otherwise...
Originally Posted By: The Critic
Originally Posted By: zeng
Lucas 75W90 GL5 for its high KV40*C of 142 cSt.
Why would this be a benefit?
High KV40C for its thicker MOFT for components protection.
12 Stage pass FZG
PAO ?
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4779556/Re:_Opinions_on_diff_fluid_cha#Post4779556
Originally Posted By: zeng
Lucas 75W90 GL5 for its high KV40*C of 142 cSt.
Why would this be a benefit?
High KV40C for its thicker MOFT for components protection.
12 Stage pass FZG
PAO ?
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4779556/Re:_Opinions_on_diff_fluid_cha#Post4779556
Last edited:
Originally Posted By: d00df00d
Just did a bit more reading on the Delvac. Seems like some people who use it in Porsche transaxles complain about poor shifting when cold, even in moderate ambient temps. No such issues with Gear 300.
Part of me feels like there has to be something with comparable cred to the Delvac, and better cold viscometrics. But man, Delvac's cert/spec list is LONG. Maybe the answer to this thread is Delvac for warm/hot climates or track use, and something else otherwise...
Mine shifts fine when cold - maybe a little more notchy than the Castrol Syntrax I ran previously. You could try Swepco 201 or Shell Spirax S5 ATE if you need a transaxle oil.
Just did a bit more reading on the Delvac. Seems like some people who use it in Porsche transaxles complain about poor shifting when cold, even in moderate ambient temps. No such issues with Gear 300.
Part of me feels like there has to be something with comparable cred to the Delvac, and better cold viscometrics. But man, Delvac's cert/spec list is LONG. Maybe the answer to this thread is Delvac for warm/hot climates or track use, and something else otherwise...
Mine shifts fine when cold - maybe a little more notchy than the Castrol Syntrax I ran previously. You could try Swepco 201 or Shell Spirax S5 ATE if you need a transaxle oil.
I'd run Delvac 75W-90 if I can easily get my hands on it. It can service the parent's car as well as the Subarus I maintain.
Amsoil Severe Gear Oil! Recommended by Chemist and few others. 100,000 miles or 50,0000 miles (Severe interval).
SAE 75W-90 (SVG) SAE 75W-110 (SVT) SAE 75W-140 (SVO)
Kinematic Viscosity @ 100°C, cSt (ASTM D445) 15.9 20.9 26.1
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 102.4 139.9 177.7
Viscosity Index (ASTM D2270) 166 174 181
Brookfield Viscosity, cP @-40°C (ASTM D2983) 78,400 102,100 109,400
Flash Point, °C (°F) (ASTM D92) 208 (406) 216 (421) 210 (410)
Pour Point, °C (°F) (ASTM D97) -43 (-45) -44 (-47) -43 (-45)
Copper Corrosion (ASTM D130) 1b 1b 1b
@ 121 °C (250°F) / 3hr
Falex Procedure B (ASTM D3233) (failure load, lbf.) >3500 >3500 >3500
Foam Stability (ASTM D892) 0/0, 10/0, 0/0 0/0, 20/0, 0/0 0/0, 20/0, 0/0
I have no scientific data to support Amsoil or any other fluid. But, Amsoil goes in my Montero. Pablo is a great asset. I don't know him personally, but he has been a great resource.
Respectfully,
Pajero!
SAE 75W-90 (SVG) SAE 75W-110 (SVT) SAE 75W-140 (SVO)
Kinematic Viscosity @ 100°C, cSt (ASTM D445) 15.9 20.9 26.1
Kinematic Viscosity @ 40°C, cSt (ASTM D445) 102.4 139.9 177.7
Viscosity Index (ASTM D2270) 166 174 181
Brookfield Viscosity, cP @-40°C (ASTM D2983) 78,400 102,100 109,400
Flash Point, °C (°F) (ASTM D92) 208 (406) 216 (421) 210 (410)
Pour Point, °C (°F) (ASTM D97) -43 (-45) -44 (-47) -43 (-45)
Copper Corrosion (ASTM D130) 1b 1b 1b
@ 121 °C (250°F) / 3hr
Falex Procedure B (ASTM D3233) (failure load, lbf.) >3500 >3500 >3500
Foam Stability (ASTM D892) 0/0, 10/0, 0/0 0/0, 20/0, 0/0 0/0, 20/0, 0/0
I have no scientific data to support Amsoil or any other fluid. But, Amsoil goes in my Montero. Pablo is a great asset. I don't know him personally, but he has been a great resource.
Respectfully,
Pajero!
No one mentioned it so I will. Installed Schaeffers 75W-90 in my Subaru a few months ago. No strange noises and everything seems fine. Sure has a lot of certifications. Is it better than the rest? I'm not qualified to say...
In my opinion (IMO), the brand matters not, it all comes out of the same tank ! "How much are you willing to OVERPAY for a Rolls Royce brand" ? AM I wrong or right ?
There is some truth to Amsoil and Redline as far as basestocks go - but now that RL is a P66 subsidiary, could that mean that their corporate overlords are making changes to the formula to streamline it with Kendall?
JHZR2
Staff member
Originally Posted By: d00df00d
Originally Posted By: JHZR2
My evidence was that redline would repeatedly get louder in my BMW E30 LSD. People would pump it, but it wouldn't last.
Same thing as I evidenced for MT shift feel.
I had the same experience with Red Line fluids in my old E36 M3, as have my friends who've run those fluids in their E36s, E46s, and E39s.
Originally Posted By: JHZR2
Specialty Formulations was the best diff oil.
That's the name I was trying to remember!
Originally Posted By: JHZR2
Ive observed spectacular cleaning from Mobil 1, and great performance from Amsoil Severe Gear.
Performance as determined how?
Ive come to appreciate this thread more as I'm looking to buy some lube to service a few differentials this summer. It seems like some specifications have gotten worse or changed.
To answer your question above, M1 was observed cleaning in high mileage MB differentials. SVG was observed to show less emulsified water in the front diff, and provide good performance (chatter and lockup in off road conditions) of my LSD in the rear of my truck, FWIW.
Mobil 1 and SVG pour points have gotten worse since Ive looked last, especially M1. I'm not a PAO fanatic, nor am I one who cares that much about PP, but it's just an observation.
And to that end I'm not sure I'd pay a premium for M1. I'm also not sure I'd pay a premium for SVG anymore if I can digest Delvac synthetic 75w-90 for $47/gal on Amazon. SVG does suppppsedly have a unique chemistry though, so it's still in the mix, but I may also have Valvoline Synpower and Supertech in my range for low power old diesel diffs. The Schaefer product also looks decent.
Nine of these are necessarily money no object super exotic lubes, but it is a challenge to determine what might be the best choice and why.
Originally Posted By: JHZR2
My evidence was that redline would repeatedly get louder in my BMW E30 LSD. People would pump it, but it wouldn't last.
Same thing as I evidenced for MT shift feel.
I had the same experience with Red Line fluids in my old E36 M3, as have my friends who've run those fluids in their E36s, E46s, and E39s.
Originally Posted By: JHZR2
Specialty Formulations was the best diff oil.
That's the name I was trying to remember!
Originally Posted By: JHZR2
Ive observed spectacular cleaning from Mobil 1, and great performance from Amsoil Severe Gear.
Performance as determined how?
Ive come to appreciate this thread more as I'm looking to buy some lube to service a few differentials this summer. It seems like some specifications have gotten worse or changed.
To answer your question above, M1 was observed cleaning in high mileage MB differentials. SVG was observed to show less emulsified water in the front diff, and provide good performance (chatter and lockup in off road conditions) of my LSD in the rear of my truck, FWIW.
Mobil 1 and SVG pour points have gotten worse since Ive looked last, especially M1. I'm not a PAO fanatic, nor am I one who cares that much about PP, but it's just an observation.
And to that end I'm not sure I'd pay a premium for M1. I'm also not sure I'd pay a premium for SVG anymore if I can digest Delvac synthetic 75w-90 for $47/gal on Amazon. SVG does suppppsedly have a unique chemistry though, so it's still in the mix, but I may also have Valvoline Synpower and Supertech in my range for low power old diesel diffs. The Schaefer product also looks decent.
Nine of these are necessarily money no object super exotic lubes, but it is a challenge to determine what might be the best choice and why.
Thanks, JHZR2.
I was actually inspired to ask this question by my own search for a gear oil. FWIW I ended up settling on Motul Gear 300 75W-90, largely because of its viscometrics; among the high-end synthetic gear lubes I've looked at, it has the highest VI and the lowest KV40 by pretty substantial margins, which seems good for me because I live very close to a highway and sometimes end up at 60 MPH within 5 minutes of a cold start. Plus, FCP Euro carries it, which means free diff fluid changes for life, minus shipping costs. :]
The Delvac 75W-90 looks insane, though. Can't remember the last time I saw an approval list so long I had to scroll...
I was actually inspired to ask this question by my own search for a gear oil. FWIW I ended up settling on Motul Gear 300 75W-90, largely because of its viscometrics; among the high-end synthetic gear lubes I've looked at, it has the highest VI and the lowest KV40 by pretty substantial margins, which seems good for me because I live very close to a highway and sometimes end up at 60 MPH within 5 minutes of a cold start. Plus, FCP Euro carries it, which means free diff fluid changes for life, minus shipping costs. :]
The Delvac 75W-90 looks insane, though. Can't remember the last time I saw an approval list so long I had to scroll...
Cool thread, am planning on the next service in the Colorado to do diffs and Tx Case in synthetics.
Delvac 75W-90 was one of the candidates.
BTW, my last truck specced 75W140...and I lashed out and got RP...that was a mistake. Less than a year later, it "globbed" out black and...globby...did a couple of flushes with mineral LS90 to get it out, then put in Castrol...
Delvac 75W-90 was one of the candidates.
BTW, my last truck specced 75W140...and I lashed out and got RP...that was a mistake. Less than a year later, it "globbed" out black and...globby...did a couple of flushes with mineral LS90 to get it out, then put in Castrol...
I put this in the wife's Captiva front to rear...
https://www.penriteoil.com.au/products/pro-gear-75w-90-full-syn
Gear shift is very good.
https://www.penriteoil.com.au/products/pro-gear-75w-90-full-syn
Gear shift is very good.
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