Hi guys, I am currently trying to figure out what would be the best manual trans oil for my 06 Mazdaspeed6.
The manual states to use GL-4, since there is no LSD up front. Fluid change intervals are like 30k miles, but I do it once a year (15k-20k miles).
I'm currently using Red Line MT-90 75W90 GL-4 Gear Oil.
The Red Line stuff isn't too bad, but it seems to only work flawlessly when it's 60ºF outside. When it's hotter, it feels as if water is my trans fluid, kinda like there is no lubrication and it's hard to engage gears. When it's colder, it simply feels thick and hard to engage.
A friend recommended some kind of synthetic gear oil (Castrol I believe), available at Ford dealers, it just has to be ordered. Anyone know of some thing like this?
I'm just curious as to see what else is available out there, and if there is something that will better suit my needs.
If this helps, I live in an Illinois climate, I drive about 50/50 city/highway, not to aggressively, I rev-match every shift, and I track my car on average 2 times a year (road course).
Thanks!
-Matt
The manual states to use GL-4, since there is no LSD up front. Fluid change intervals are like 30k miles, but I do it once a year (15k-20k miles).
I'm currently using Red Line MT-90 75W90 GL-4 Gear Oil.
The Red Line stuff isn't too bad, but it seems to only work flawlessly when it's 60ºF outside. When it's hotter, it feels as if water is my trans fluid, kinda like there is no lubrication and it's hard to engage gears. When it's colder, it simply feels thick and hard to engage.
A friend recommended some kind of synthetic gear oil (Castrol I believe), available at Ford dealers, it just has to be ordered. Anyone know of some thing like this?
I'm just curious as to see what else is available out there, and if there is something that will better suit my needs.
If this helps, I live in an Illinois climate, I drive about 50/50 city/highway, not to aggressively, I rev-match every shift, and I track my car on average 2 times a year (road course).
Thanks!
-Matt
