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MolaKule: saying RL MTL 75W80 you mean MTL 70W80 ? due to your answer to my 1st question I reason: - friction is important for the synchronizers - viscosity for forks and rods How does the tribologist decide the best viscosity scope for a gearbox. Providing that he determined the correct...

@MolaKule: I studied your recommended link. Although there remain questions: 1. Why is the shiftability not only a matter of the correct friction but also of the viscosity ? 2. What is the danger of too low viscous oil in hot temps ? In many threads thicker oil at higher temps is claimed as...

@mechtech2: Thanks, you are right, my words were blindfold. Sorry !!!

@mechtech2: Sadly my car is used from my wife very often only for short trips. In these cases the running temp of gear oil is never reached. On top of that my wife has not really a technical feeling in order to stroke the gearbox in cold temps. So I think cold temp shifting is more important...

thanks for answers ! @MolaKule: yes it is my assumption too. It is not a issue of worn parts, but a matter of the correct oil. I wasn't sure if viscosity is too high or low. A few minutes ago I read a thread out of 2005 where scout wrote: ----------------------------- quote:Originally posted...

Hi Guys, first of all the facts: car: Hyundai H300 TurboDiesel van HP: power enhanced from 170 HP to 200 HP torque: 450 NM mileage: 50.000km rear axle driven, normal Diff, Manual 5speed transmission At low temperature (down to -15°C) shifting from 1st to 2nd and 2nd to 1st was very hard and...