Show whole topic Oct 17, 2018 10:40 pm
Mark Offline
Member
Registered since: Feb 05, 2009
Location: Worcestershire


Subject: M45 Gearbox Oil
Hopefully someone has an answer to this question(s). Perhaps an oil technologist is a forum member?
I have just changed the oil on a T8 gearbox using EP90 API GL5 spec which is one of the recommended gearbox lubricants in the clubs M45 Manual (it was also the preferred gearbox lubricant of the late great Phil Ridout) There is I believe no longer a problem with EP oils attacking yellow metals in a gearbox as was the case when it contained sulphur around 15 years ago.
Back to the question, having run the engine I removed the gearbox top cover to find the oil was heavily frothed, bubbles everywhere and took about 20 minutes to settle in the bottom of the gearbox. There was no contamination of different oils as the change was like for like.
The questions are whether this frothing is something EP oils are prone to doing and whether in itself it has any detrimental effect?
Opinions, experience or reassurance welcomed
Many thanks
Mark