What 75w85 GL-5 hypoid rear diff fluid for those with LSD?

[djerickd]

Saw this a wally world and thought it might be a good choice since it has LSD additive already in it.

Thoughts?

Product details​

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Valvoline's™ NEW FlexFill™ Full Synthetic Gear Oil is formulated for ultimate protection and performance. A thermally stable, extreme-pressure gear lubricant, it is designed to operate and protect in both high and low extreme-temperature conditions. Recommended for limited-slip hypoid differentials and is compatible with conventional gear lubricants. Now available in a squeezable pouch for less waste and easier application.

• Valvoline Full Synthetic Gear Oil is a superior sulfur-phosphorus extreme pressure gear lubricant
• Contains a limited slip additive for optimal performance of the clutch pack and an anti-foam agent for better lubrication
• Protects gear teeth from rust and corrosion
• Special additives to reduce chattering in limited-slip differentials
• Provides outstanding thermal stability for cleanliness and longer service life
• Maintains excellent low temperature fluid protection
• Formulated with synthetic basestocks and additives to provide excellent performance
• For use in axle applications requiring factory-fill or drain-and-fill levels of limited slip performance
• Recommended for conventional and limited slip differentials and non-synchronized manual transmissions where API GL-5 or API GL-4 fluid is specificed
• Easy-to-use flexible pouch works in tight spaces and creates less waste

 

[AWDGT2]

Good stuff, Amsoil makes an equivalent that I just used. Either will be good, I found the factory stuff less than adequate.

 

[djerickd]

Good stuff, Amsoil makes an equivalent that I just used. Either will be good, I found the factory stuff less than adequate.

Did you run the Amsoil Slip lock LSD additive product also?

 

[JSolo]

There's also this, 75W85 GL-5 Gear Oil

Not to be confused with their MT-85 manual trans oil.

 

[djerickd]

There's also this, 75W85 GL-5 Gear Oil

Not to be confused with their MT-85 manual trans oil.

I like how this and the Valvoline mention that no additional friction modifiers are required for LSDs

 

[JSolo]

I've used the redline stuff before with pretty good results, both in the MT and rear ends. On this car, they say the transfer case is sealed, but don't believe that. Just like sealed trans's.

 

[AWDGT2]

Did you run the Amsoil Slip lock LSD (Limited Slip Differential) additive product also?

Amsoil recommends the LSD additive but the AWD cars like mine are W/O LSD

 

[General_Vodka]

as far as additives go, I put tribotex into all my oils as a test. The conditions haven't exactly been perfect for them but I guess if they didn't show any damage with harsh conditions then they should be safe under normal conditions. Lets see.... LSD additive: added along with my BMS diff brace, couple of months later the diff brace snapped one of the diff cover bolts and my diff oil started leaking. Had to drill out the broken bolt stuck in the LSD. Attributed the snapped bolt to poor bolt design and the BMS brace being misaligned due to a designed flaw with the subframe bracket. BMS did send me new bolts, and if you have the old bolts I STRONGLY recommend getting the new ones. LSD still functioned great, and man i did abuse the snot out of it since i didn't know it was leaking.... oooof. But wait, there's more. I replaced the transmission oil cooler more than a year ago since it was damaged. i thought it was an engine oil cooler so i didn't think much about the lost fluid. It wasn't and i have been driving around with 3 quarts missing from my transmission for over a year. only recently when I installed my BMS trans cooler that I realized my screw up. Filled the trans with oem fluid and transmission feels a lot better. Did an oil analysis and test came back good, the additive didn't mess anything up. Now for the engine, added the additive a while ago same with all the others. Recently my drive belt came off while drifting, the engine overheated and blew coolant everywhere. The oil was black but didn't show any signs of coolant leaks. Changed the oil and refilled the coolant, so far so good. Gotta send out the oil for a test.

 

[djerickd]

as far as additives go, I put tribotex into all my oils as a test. The conditions haven't exactly been perfect for them but I guess if they didn't show any damage with harsh conditions then they should be safe under normal conditions. Lets see.... LSD (Limited Slip Differential) additive: added along with my BMS diff brace, couple of months later the diff brace snapped one of the diff cover bolts and my diff oil started leaking. Had to drill out the broken bolt stuck in the LSD (Limited Slip Differential). Attributed the snapped bolt to poor bolt design and the BMS brace being misaligned due to a designed flaw with the subframe bracket. BMS did send me new bolts, and if you have the old bolts I STRONGLY recommend getting the new ones. LSD (Limited Slip Differential) still functioned great, and man i did abuse the snot out of it since i didn't know it was leaking.... oooof. But wait, there's more. I replaced the transmission oil cooler more than a year ago since it was damaged. i thought it was an engine oil cooler so i didn't think much about the lost fluid. It wasn't and i have been driving around with 3 quarts missing from my transmission for over a year. only recently when I installed my BMS trans cooler that I realized my screw up. Filled the trans with oem fluid and transmission feels a lot better. Did an oil analysis and test came back good, the additive didn't mess anything up. Now for the engine, added the additive a while ago same with all the others. Recently my drive belt came off while drifting, the engine overheated and blew coolant everywhere. The oil was black but didn't show any signs of coolant leaks. Changed the oil and refilled the coolant, so far so good. Gotta send out the oil for a test.

Hows the car doing? Still good to go?

 

[Stinger GT SS]

For those interest heres a copy of the TSB for the oil upgrade with friction modifier & a pics of Kia Genuine & a one of an Aussie equivalent.

 

[General_Vodka]

Hows the car doing? Still good to go?

So far so good

 

[5tinger]

For those interest heres a copy of the TSB for the oil upgrade with friction modifier & a pics of Kia Genuine & a one of an Aussie equivalent.

View attachment 71512

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Does H/K distribute the 0w30 wngine oil?
It's quite interesting, viscosity of a 20 cold and 30 when hot.

 

[Stinger GT SS]

Does H/K distribute the 0w30 wngine oil?
It's quite interesting, viscosity of a 20 cold and 30 when hot.

Sorry I’m having a blonde moment but what/who are H/K?

 

[JSolo]

Hyundia Kia?

 

[Stinger GT SS]

Hyundia Kia?

Ah thanks

 

[Stinger GT SS]

Does H/K distribute the 0w30 wngine oil?
It's quite interesting, viscosity of a 20 cold and 30 when hot.

I have no idea, my dealer uses Castrol.

 

[SRV]

Every oil-manufacturer report I've read always dissuades adding additional additives to their oil package as it will upset the formulation and cause problems which are not readily apparent. One of the biggest offenders are people adding zinc to their engine's oil.

Their recommendation is to buy the proper oil in the first place and run it as is for best results. They are the experts and actually understand the chemistry involved.

 

[5tinger]

Every oil-manufacturer report I've read always dissuades adding additional additives to their oil package as it will upset the formulation and cause problems which are not readily apparent. One of the biggest offenders are people adding zinc to their engine's oil.

Their recommendation is to buy the proper oil in the first place and run it as is for best results. They are the experts and actually understand the chemistry involved.

The Mega Turbo SYN is Hyundai/Kia/Genesis propriety blended 0w30 oil which is recommended for the Stinger.

I haven't found it distributed anywhere in Australia.

 

[djerickd]

This turned from a rear end fluid discussion into an engine oil talk?? LOL

 

[keplaffintech]

I think it's important to find a suitable non-OEM oil for these diffs. I've heard ridiculous prices for the genuine oil and paying that every time the diff needs an oil change is unacceptable (particularly once these are out of warranty).