I just got done changing all my fluids to redline synthetic. I noticed that there is a MTL oil for the trans. I have the non limited slip differential and 6 speed trans.
Heres what I got
5 quarts of 5w-30 motor oil
4 quarts of 75-90 gear oil
1 quart of 75-90ns (the did'nt have anymore without ns,the parts guy told me that the ns has a friction modifier, but redline ws says the opposite) .
My question should I be concerned about the friction modifier in the diff and the gear oil in the trans(not mtl oil type)
The redline WS says the 75-90 works well in manual tranmissions. I think I'm fine, but after spending all that money I don't want to have to change it all again.
The 75w-90ns does not contain the friction modifiers, so the guy just fed you a line to sell you some extra oil. What exactly did you change out? I assume you did the rear diff, and IIRC, it's around 3 qts of oil. Based on that, can I assume you used the 3 qts of oil that contained the friction modifiers? I think if you had to top it off with some of the NS, you'll be fine, and/or if you used the NS in the front diff or the transfer case, you're fine as well (although it doesn't seem like you have enough oil to do all 3 cases).
All I can say about the 6 speed is that it doesn't make much sense to use the 75-90 gear oil when (as you've pointed out) Redline makes an oil specifically designed for manual trannys. The 75-90 gear oil is thicker than the MT-90, so you might see a difference in shifting performance.
I changed the rear diff and the trans. I put the one quart of ns in the rear diff. The redline oil is a lot thinner than the oil that came out of the diff. The oil that came out of the trans was like water coming out(very thin). The trans actually feels better and quieter than it did with the stock stuff. I dont know what the viscosity of the mt90 is but I dont think it could be that much thinner than the 75-90.
I changed the rear diff and the trans. I put the one quart of ns in the rear diff. The redline oil is a lot thinner than the oil that came out of the diff. The oil that came out of the trans was like water coming out(very thin). The trans actually feels better and quieter than it did with the stock stuff. I dont know what the viscosity of the mt90 is but I dont think it could be that much thinner than the 75-90.
They guy at the store doesn't know what the hell he is talking about...
NS = No LSD Modifier
If you put an entire quart of that 75-90NS Fluid in your rear diff then you most likely don't have enough friction modifier in the rear differential. If you don't feel it now you will prolly be feeling it in a couple hundred miles the rear diff will start chattering when you go around corners. If I were you I'd go find 3 more bottles of the regular 75-90 fluid and completely replace the rear diff fluids again. Don't try to add a tube of friction modifier to it, that would be like mixing different oils which is not good.
The LSD Modifier is mixed in the 75-90 oil in a predetermined amount much like 50/50 antifreeze. Therefore like antifreeze you will throw off the ratio of oil to modifier if you add a bottle of non-LSD modified oil to it. So if you added 3 quarts total and 2 quarts of LSD Oil to 1 Quart of non-LSD oil then you only have 2/3's of the LSD Modifier that is recommended by Redline.
I'd say just watch it for now and if you start to get chattering then replace the oil ASAP, chattering is not good for the LSD Shoes inside the Differential.
__________________ 2006 Toyota Tacoma DCab Long Bed SR5 V6 5spd Auto 4x4
Tow Package, 6 CD Changer, Rear Limited Slip Differential, 16" Alloy Wheels
Silverstar H4 Headlamps and Silverstar 9005 Foglamps, Bed Storage Utility Lock Mod, Redline Tuning Gas Hood Struts, Roll-N-Lock M-Series Retractable Tonneau Cover
I put the oil with friction modfier in the diff but the diff is NOT a lsd. I guess I got one quarts of friction modifier and two without. I Dont think the modifier will hurt the open diff.
The manual says to put a 75-90w oil in the trans
Plus the redline seems pretty thin, not like a dino 90w gear oil.
Oh sorry, I thought you said you had an LSD, nevermind then. The Redline 75W-90NS DOES NOT have the Friction Modifier the regular 75W-90 DOES have it already mixed in. No worries though it won't hurt anything if you don't have an LSD. Read the Redline website the guy who told you that the NS Has the modifier was lying or doesn't know what he is talking about.
NS is acually short for "not slippery" so that's how I always remember offhand.
Taken directly from my website..
Designed to provide the highest degree of protection and greatest efficiency for your drivetrain. Red Line provides a complete line of drivetrain lubricants which are optimized for differential, transmission, or transaxle use over a wide range of temperatures. Proper selection depends upon the manufacturers' requirements and whether the application is for passenger automotive, commercial, or racing use. Red Line Gear Oils contain polyol ester basestocks to provide excellent lubrication even under extreme conditions of high-loading and high- temperatures--their natural lubricity provide excellent slipperiness which reduces the sliding friction in hypoid gears to reduce wear and temperatures. The synthetic basestocks have a natural multigrade property, so large amounts of unstable thickeners are not required to manufacture our gear oils, which means that Red Line Gear Oils will provide a stable viscosity for even extended periods of use. Red Line also manufactures gear oils which can be used in limited-slip differentials without the use of additional friction modifiers.
75W90NS: 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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