Thank you for pointing this out as I really should've done my homework on this. :bonk: After searching google and reading many GL4 vs GL5 links I assumed I was okay to leave the LiquiMoly GL5 gear oil in my transmission. However, just to be sure I emailed the company (Liqui Moly) last night and received a response today. They recommend I remove the GL5 gear oil and replace it with their GL4+ version. I just ordered 3 bottles of GL4 gear oil and plan for a gear oil change ASAP. During my google search, some people posted that a few manufacturers of GL5 gear oil claim to be safe to use on transmissions requiring GL4 oil. Lot's of debates if you're brave enough to google search and read links/articles/forums, however, I was still left in confusion. :mad0259: The krappy thing is that our owners manual does not state which gear oil to use.
(At least I couldn't fine it.) Bottom line, reach out to the manufacturer if you're not clear whether or not the gear oil that you want to use in your racecar is safe
(Obviously, OEM gear oil is fine...expensive....but fine.)