Today I changed the oil in my '06 Toyota Matrix 5-speed at 21K miles.
<br/> The owners manual calls for 75W-90 GL4 or GL5, so I used Valvoline 75W-90 GL5 oil.
<br/> It really needed changing as the oil was dark with a metallic sheen, and these trannys have had a number of early failures (60-100K mi.)
<br/> I mentioned this on a couple other forums and someone said using GL5 will mess up my transmission because of high sulfur content.
<br/> I checked back at the nearby auto parts store and they had no GL4 oils.
<br/> I could find no mention of this on Toyota or Valvoline's websites.
<br/> I google searched and found some conflicting opinions.
<br/> I'm hoping an expert like Transman will give me the straight dope.
<br/> Does GL5 supersede GL4? Should I seek out GL4 and change the oil again?