- Joined
- Dec 30, 2006
- Messages
- 29,558
There`s something I`ve been wondering about concerning these two classifications of gear oils. GL4 is basically a "toned down" version of GL5 per se from what I understand (lower levels of certain additives),or am I uneducated about the chemistry of the two?
Reason I ask,is that if GL4 gear oils are "old technology" (I read that on some car forum somewhere,can`t remember where) and today`s GL5 oils are way more advanced than yesterday`s,would a GL5 (or at least one that`s rated GL5 and MT1) oil be better in a manual tranny because of better gear shock/load protection via extreme pressure additives? I keep hearing/reading about people using GL5 gear oils for years in their manual trannies with no issues at all. If a manual tranny has no ill effects (no brass syncho issue) would a GL5 oil be a better choice for gear protection?
If this makes no sense,I apologize in advance :^) I`m just trying to learn all I can.
Reason I ask,is that if GL4 gear oils are "old technology" (I read that on some car forum somewhere,can`t remember where) and today`s GL5 oils are way more advanced than yesterday`s,would a GL5 (or at least one that`s rated GL5 and MT1) oil be better in a manual tranny because of better gear shock/load protection via extreme pressure additives? I keep hearing/reading about people using GL5 gear oils for years in their manual trannies with no issues at all. If a manual tranny has no ill effects (no brass syncho issue) would a GL5 oil be a better choice for gear protection?
If this makes no sense,I apologize in advance :^) I`m just trying to learn all I can.