Quote:
Originally Posted by IronDuke
I known this is a dead thread, but I just hit 1000 miles and put Red line MT90 in my MT, just because I've always changed out fluids on all my vehicles after the break in period. I used to own a Jeep Wrangler and Redline works very well with them, so I figured why not. Well gears 1-3 are very grindy now. I've ordered Motul and will post the results. The MT90 was very thin and after reading the label it states it can be used as engine oil 10w- 40, wtf?
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The viscosity ratings on gear oil aren't the same as those for engine motor oil. You are correct that the 75w-90 wt for gear oil is roughly equivalent to 10w40 motor oil. I used MT90 on my son's Mazda3 and it works great. I tried Motul on this car and found it to be pretty notchy, especially in the mornings. I've since tried a 50/50 blend of Motul and Royal Purple Synchromax and this is the best formula so far. I've gone through the winter and also gotten it up to track temperatures and overall, it is the best. YMMV.