monty Posted July 23, 2019 Report Share Posted July 23, 2019 What are people's thoughts on the oil change intervals for a gearbox with J type overdrive. It was 6 years ago when I last did a change but only 6000 miles since. Should I change due to the time or not bother yet because of the low mileage. Another conundrum for cars that cover low mileages! Quote Link to post Share on other sites
Steves_TR6 Posted July 23, 2019 Report Share Posted July 23, 2019 Coincidentally imlast changed my tr6’s gearbox/j type overdrive 6 uears ago too Monty am about do do anual engine oil change so maybe i should do both...... steve Quote Link to post Share on other sites
ctc77965o Posted July 23, 2019 Report Share Posted July 23, 2019 At 1000 miles/yr i think that changing it once every 25years would be on the safe side, for most of these cars lives the gearbox oil was never changed and they worked just fine. Quote Link to post Share on other sites
Andy Moltu Posted July 24, 2019 Report Share Posted July 24, 2019 It does to an extent depend on what oil your gearbox is filled with. Standard 40 monograde gearbox oil should last a long time. if it has been filled with multigrade oil, particularly 20/50 engine oil then annual changes might be considered as the additive packages & viscosity enhancers can be sheared by the gears and thus have a relatively short life in a gearbox application. Quote Link to post Share on other sites
monty Posted July 24, 2019 Author Report Share Posted July 24, 2019 1 hour ago, Andy Moltu said: It does to an extent depend on what oil your gearbox is filled with. Standard 40 monograde gearbox oil should last a long time. if it has been filled with multigrade oil, particularly 20/50 engine oil then annual changes might be considered as the additive packages & viscosity enhancers can be sheared by the gears and thus have a relatively short life in a gearbox application. 1 hour ago, Andy Moltu said: It does to an extent depend on what oil your gearbox is filled with. Standard 40 monograde gearbox oil should last a long time. if it has been filled with multigrade oil, particularly 20/50 engine oil then annual changes might be considered as the additive packages & viscosity enhancers can be sheared by the gears and thus have a relatively short life in a gearbox application. Always been filled with Penrite Gear 40. The last change showed clean oil & neglible deposits on the overdrive filters. Quote Link to post Share on other sites
iain Posted July 24, 2019 Report Share Posted July 24, 2019 Recommended for Tr2-3, top up at 6,000 and drain and replace at 12,000 miles. For me I drain/replace at 6000 miles. What price reliability? Approx £15 plus some rolling around under the car Quote Link to post Share on other sites
monty Posted July 24, 2019 Author Report Share Posted July 24, 2019 4 hours ago, iain said: Recommended for Tr2-3, top up at 6,000 and drain and replace at 12,000 miles. For me I drain/replace at 6000 miles. What price reliability? Approx £15 plus some rolling around under the car It is not the cost, just the inconvenience, lack of home facilities & the disinclination @ 73 to crawl under the car! Does modern quality correct gearbox oil deteriorate in 6 years or 6000 miles is the real conundrum. Quote Link to post Share on other sites
ctc77965o Posted July 25, 2019 Report Share Posted July 25, 2019 16 hours ago, monty said: Does modern quality correct gearbox oil deteriorate in 6 years or 6000 miles is the real conundrum. No, it does not. Its heavily stabilised to operate in churning air/oxygen at high temperatures for many years... So sitting in a cold stationary gearbox it will last decades. Quote Link to post Share on other sites
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