Geofftaylor Posted July 22, 2023 Report Share Posted July 22, 2023 What gearbox oil is recommended for a TR3 with O/D? I have had a good look on the internet and there are numerous schools of thought and numerous ideas on this subject. The manual states that engine oil is suitable but I know that this was changed to a thicker grade. Quote Link to post Share on other sites
Hamish Posted July 22, 2023 Report Share Posted July 22, 2023 I use Penrite gear 40. As recommended by Pete Cox and son. https://petecoxsportscars.co.uk/testimonials Quote Link to post Share on other sites
RogerH Posted July 22, 2023 Report Share Posted July 22, 2023 +1 Penrite GB40 - Do not use engine oil Roger Quote Link to post Share on other sites
monty Posted July 22, 2023 Report Share Posted July 22, 2023 Penrith GB40 in my TR4A. Quote Link to post Share on other sites
brenda Posted July 22, 2023 Report Share Posted July 22, 2023 +1 Mike Redrose Group Quote Link to post Share on other sites
ntc Posted July 22, 2023 Report Share Posted July 22, 2023 4 hours ago, RogerH said: +1 Penrite GB40 - Do not use engine oil Roger Unless you use the correct one Quote Link to post Share on other sites
Geofftaylor Posted July 22, 2023 Author Report Share Posted July 22, 2023 5 hours ago, Geofftaylor said: What gearbox oil is recommended for a TR3 with O/D? I have had a good look on the internet and there are numerous schools of thought and numerous ideas on this subject. The manual states that engine oil is suitable but I know that this was changed to a thicker grade. Thanks to all. Penrite has been ordered. cheers Geoff Quote Link to post Share on other sites
Nobbysr Posted August 14, 2023 Report Share Posted August 14, 2023 Originally Engine oils were specified beacuse they had good Detergency and Dispercentcy as well as multigrade performance (less drag at lower temperature) However ive used API -GL4 and API-GL5, 80w90 and laterly 75w90 Gear oils as have better load carrying properties than engine oils and now with wide multigrade gear oil the oils are less viscous when cold they dont lose as much viscosity when hot . I've beeen using them for 30 years with no issues but as i dont drive the car in winter now so I stick with an 80w90 gear oil Its worth mentioning that smaller lubricants companies buy in base oils and purchase addative packs to a spec/price, simply because of the cost of engine testing that they would be required to complete to claim the various specs ..I think its around $250K just to be a member of API, plus ACEA testing along with all the various OEM testing, and ..There are a number of Addative Companies that supply blenders with addative (lubrizol, Paramins, Infinium to name a few) supply Blenders . However the premium performance addative packs tend to be reserved for comapanies such as BP, Shell, Castrol, Exxon etc who are chasing initial fill contracts ... The quality of base oils is also important and the quality of both addative and base oils affect the performance of the finished product . I prepared a couple of spread sheets for one of the US forum and can add Penrite to them if the technical data is availble . There has been a great deal of spurious data surounding the use of gears oils especialy where the O/D is concened for example some friction modifiers and e.p adadtive requre increase in surface temp before they activate and these have been aledged to have cause O/D but there is not test evidence to support it all the best Steve Gearoil comparisons v2.xlsx engine oil comparison.xlsx Quote Link to post Share on other sites
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