ClayW

Redline MTL vs. Royal Purple Synchromax.....Thoughts?

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Redline MTL vs. Royal Purple Synchromax

mtl.jpgVS synchromax.gif

Does anyone have any experience to share with these? I know a lot of people use Redline MTL, but I might be able to find Royal Purple Synchromax locally. Any information and/or musings would be appreciated.

Thanks!

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Royal purple is excellent. i run it in my JDM Skyline GTR and it really helped with the synchro issues that plague these transmissions.

either one will be more than enough so buy whichever one you can get your hands on.

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both good.

redline is avail locally at speed unlimited, exit 9 on beltway by andrews.

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I recently wrestled with this for my LSD diff. I am an old Redline user (love it) but needed oil right away and Royal purple was available.

Did the searches and saw only favorable reviews. Probably 1K into it and no problems, leaks or anything. Nice and quiet...

Hope this helps!

~Jason

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Of all my BMW transmissions, I've never had one that didn't leak MTL like a a sieve. I go with Redline MT-90 and refill often. Next, I'd probably try the lightweight shockproof.

Keep in mind the Gl4/GL5 distinction. I believe GL-5 eats away the brass syncros

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I used Royal Purple in my 4 speed. Nary an issue; improved shifting substantially over whatever was in there before. My 5 speed has Redline, which is also a great product. Can't go wrong with either IMO.

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for those saying "royal purple" is good, are you speaking of the royal purple brand or synchromax specifically? i could not find information on synchromax pertaining gl4 compatibility. i do know max-gear is for gl4/gl5 applications though. i've emailed royal purple but have yet to get a response from them.

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Guest Anonymous

Royal Purple's site has the specs for Synchomax and it is GL4 compatible

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The thing to remember is that transmissions and differentials are different animals and subject to different stress loads. In fact even the viscosity classification is different but that's another story.

The gear faces of differentials are subject to extream pressure loads and require additive packages to help deal with the loads on the gear faces.

These additives are typically sulfur based and it is the sulfur that harms the brass syncros. Go ahead ask me how I know.

If you go with a transmission specific product, which the Royal Purple product is, and I'm not sure about the Red Line stuff, you don't need to worry about brass syncros.

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What do you mean you don't have to worry about synchros when using transmission specific product? The transmission is the only place that has synchros not Diff. There you just need to worry about LSD compatability if it applies.

I worry if GL4 and GL5 will work well with GL4 only transimissions. I like redline because they have fluid thats GL4 and different fluid that is GL5. It makes the distinction very clear.

Also I've called redline and talked to them. I bet royal purple techs could tell you if it'll cause problems with brass synchros.

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When I got home, I checked, and I used Royal Purple Max Lube, which is stated to be GL-4 and GL-5 compliant. As I said, I didn't have an issue in about 5k-6k miles of driving.

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Redline is great. I put redline in the 02 years ago (transmission). No problems. Also using Redline in the diff, and redline 15/50 in the car.

I've never used the Royal Purple fluid. I do use RP oil in both the E46 and Momma's R50. RP 5/30. Good Stuff. Plus - RP is made here in Texas!

I think you'll be fine either way.

Ken

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At work, we use Royal Purple brand Synfilm GT lube in our Roots-brand blowers. We buy it in 5 gallon containers.

I'm sold on the Redline MTL tranny fluid but it loves to seep out of my 4 speed tranny.

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I usually use the products that the Owner' handbook, and Repair Manual

specify - and I don't recall ever seeing the above two mentioned in your 2002 literature

try this stuff

GL-4GEAROIL.jpg

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