GTV6 gear oil observation

Started by sportiva, September 13, 2017, 03:03:07 PM

Previous topic - Next topic

sportiva

I

Alfetta77

Current:  Alfetta GTV 1977 Silver
Previous: Alfetta GTV 1980 Red

Steve S

Wear metal debris is heavy and should fall to the bottom quickly. When you drain the oil you'll get a lot of concentrated metal debris which will probably  look worse than it really is.

For extended service analysis, wear metals typically increase over time at a linear rate indicating that the wear metal debris do not accelerate wear. When the oil is spent or the compartment is pushed beyond the design parameters wear metals can accelerate exponentially. If you're really interested to know more of whats going on you should take samples and have them analysed. It's important to take a representative sample if you do. I would be interested in the results.


Colin Edwards

#3
Hi Sportiva,

Methinks the non-ferrous but metallic / magnetic gunk in your oil is a result of the E.P additives for GL5 classification.  These are usually Sulphurs and / or Phosphates that end up forming a sacrificial film on gears and synchro bits.  This film is continually sheared off the bearing surfaces and ends up in the oil.  As soon as some is sheared off the intention is for a new layer to be laid down.  Essentially a continual process.  Not sure of the chemistry involved however the particles are likely to be charged so they will be influenced by a magnetic field. 
Going to a synthetic oil is probably not a bad thing as long as the new oil chemistry supports sacrificial film creation.
Present
2023 Tonale Veloce
2018 Abarth 124 Spider
1987 75 3.0

Past
2020 Giulietta Veloce
2015 Giulietta QV
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5