14-02-2019, 04:18 PM
“Modern”oils and greases have remarkable resistance to oxidation and do not turn to treacle or gel. For moderns gearboxes/diffs sometimes filled for life, like wheel bearings. For older cars with some plain bearings oil needs to be kept reasonably clean, and crash gears are inclined to produce metal (altho Seven gears seem to resist chipping better than some other makes), so very occasional changes desirable. (The frugal can pass thru a filter or allow to stand and reuse, but best not to mix diff oil!)
If oil looks like silver paint something is wearing. Can often continue for years .The life of say a pitting 1st gear is determined more by tolerable din. As mentioned, maintaining the (low) level is vital; many today are unaccustomed to regular checks and top ups.
If oil looks like silver paint something is wearing. Can often continue for years .The life of say a pitting 1st gear is determined more by tolerable din. As mentioned, maintaining the (low) level is vital; many today are unaccustomed to regular checks and top ups.