Bristol Cars - Owners and Enthusiasts Forum  

Go Back   Bristol Cars - Owners and Enthusiasts Forum > Bristol Forums > 6 cyl Bristol cars

6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc

405 g/box & o/drive oil advice

Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 01-10-21, 07:56 AM
Join Date: Sep 2021
Posts: 29
Default 405 g/box & o/drive oil advice

HI, I've had a good trawl through the forum and can't find the info I'm after, so can anyone help with the following question?
I know that the manual specifies sae30 oil for the linked g/box and o/drive on 405s. Does anyone know if this is still the best (compromise!) or is there a modern alternative?
It would appear that the 30 grade is only recommended due to the o/drive not liking anything thicker. Has anyone tried a more viscous grade that might be more suited to the g/box as I feel 30 is, in an ideal world, nowhere near up to the job
I feel that if these units were designed today, there would be a modern, possibly sythetic oil specified.
Any help gratefully received before I go out and buy some sea30 (or even try some 40!!)
Reply With Quote
  #2 (permalink)  
Old 01-10-21, 08:59 AM
Join Date: May 2013
Location: Hereford
Posts: 31
Default 405 gearbox & od oil

Glenn, I have used 20/50 engine oil in mine for the last 40+ years with no deleterious affects or advice to do otherwise.
Reply With Quote
  #3 (permalink)  
Old 01-10-21, 08:54 PM
Join Date: Apr 2021
Posts: 116

I use Penrite gearbox oil 30 from Classic oils in Bicester

Penrite stated in a 1994 release that modern EP oils are not recommended for gearboxes, especially those with overdrives.

Penrite also make a rear axle oil suitable for classics. Mild EP is suggested for the 405.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT. The time now is 04:07 PM.

This is the live site

Search Engine Friendly URLs by vBSEO 3.6.0 PL2