20-50 oil is Thicker than 75-90 gear oil

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
2,043
Reaction score
2,362
always thought it was weird 75-90 feels much thinner pouring than 80-90. I know one is usually synthetic and the other not but it's a noticeable difference. doesn't surprise me 75 90 is as thin as 20w50.

red line MTL is called a 75-80 gear oil but I sware it pours like a 5w30 or thinner motor oil. corvette guys say mtl is to thick for their manual trannys that call for dex 6. so they mix 2qt mtl and 2 qt atf. I honestly can't tell a difference, always run straight MTL 75-90 in trannys that call got dex 3 and 6 with good results and sweet wot shifts.

some older manual trannys called for straight sae 30w motor oil.
 

Forum statistics

Threads
129,429
Posts
1,815,919
Members
92,644
Latest member
Yukrazy

Latest posts

Top