Gear oil for 5mt, Motul or Redline

[Sgt.Gator]

Sorry for the delayed response. Why I don't use Shockproof....From the Redline Gear Oil Tech PDF:

 

"ShockProofTM EP Gear Oil - a unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness greater than an SAE 250 grade, with the same low fluid friction as with the 75W90. Recommended for off-road racing and problem gearboxes. Also available in LightWeight and SuperLight viscosities."

 

I don't Off Road Race (as in sand and rocks), and I don't have a problem tranny.

 

And I copy now from this thread on NASIOC:

https://forums.nasioc.com/forums/showthread.php?t=911946&highlight=shockproof

 

"SuperLight ShockProof™

A unique product with the viscosity of 75W90 gear oil but lower internal friction similar to that of an ATF. Used when temperatures are not high and when the maximum power output is required such as in stock car qualifying laps.

Used in two-stroke and four-stroke motocross transmissions (often mixed in equal parts with LightWeight ShockProof™ Gear Oil).

Used in 80cc and 125cc shifter kart transmissions.

Used in low-power road racing transaxles like Formula Vee and low-power SCCA Production classes (dog-ring type, generally not syncro application where this product can be slippery)."

 

"LightWeight ShockProof™

A unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures. Similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil.

Used in two-stroke and four-stroke motocross transmissions (often mixed in equal parts with SuperLight ShockProof™ Gear Oil).

Used in most road-racing differentials with moderate power and dogring racing transaxles."

 

"Heavy ShockProof™

A unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90."

 

75W90 NS

This GL-5-type gear oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin."

 

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Finally, Redline posted in that thread:

 

"Guys, there used to be issues at times with the medium coming out of suspension with Shockproof, but changes to the formula a few years back solved all of that.

 

While the theory that Shockproof's medium could wear on syncros is realistic but seldom realized, it's more of an issue that this fluid doesn't work when filters, screens, pumps, or small lines are invovled. It can cause clogging due to its affinity for metal, so it's more suitable for dog boxes and/or really synchro splash boxes. We hate to be so vague with application data on this product, but it's tough to know the details of every gearbox and where complications could arise. However, we do hear from lots of happy customers with Subarus that use Shockproof. We still need to recommend the NS, as it's a GL5 that meets the Sube requirement.

 

Best,

 

Cameron Evans

Red Line Oil

 

And

 

We won't tell you that Shockproof works in the STi simply because we haven't seen it for ourselves. There are some pumps and coolers that can use Shockproof, but you need to have a lot of pump pressure and pretty big lines to ensure that the cholesterol effect due to affinity for metal won't clog it up. Again, we're careful about our reputation and level of expertise. This is a relatively small gearbox and that little pump might not be able to push the fluid.

 

There are many applications where we are very dialed in with the top builders or racers, so making an application is a no brainer. The coefficient of friction with Shockproof is actually lower than with 75W90NS, so wearing out synchros isn't very likely.

 

When comparing Shockproof to our traditional gear oils, it's first a matter of making sure it doesn't get stuck in a pump, line or filter. When it's then deemed safe to use it's a matter of shiftability--if it won't shift the way you'd like, it probably isn't treating the syncros well. If all proves fine, then you're good to go.

 

Does that help?

Cameron Evans

Red Line Oil"

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IMHO Shockproof may make sense for dog gear boxes, but not for production trannys like ours.

[NORULZleggy]

every fluid in all my subies is Amsoil. My lawn mower and weed eater has it also. I have been a dealer for years. Love the stuff.