minimaquinas Posted June 8, 2015 Share Posted June 8, 2015 Hi guys changing oil on a r380 gearbox from atf to mtf94 would it be ok to also mix with moly slip thanks in advance Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 8, 2015 Share Posted June 8, 2015 If it was that good, the vehicle manufacturers would put it in... Quote Link to comment Share on other sites More sharing options...
Boydie Posted June 8, 2015 Share Posted June 8, 2015 Why ? Moly-slip like the name implies has a low, very low friction co-efficient, in a syncro gearbox you need friction to assist the syncro rings to meld. Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted June 8, 2015 Author Share Posted June 8, 2015 The gearbox has got excessive noise so thaught it might give it a longer lease of life Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 8, 2015 Share Posted June 8, 2015 Changing the oil alone will help with that. Quote Link to comment Share on other sites More sharing options...
Boydie Posted June 8, 2015 Share Posted June 8, 2015 Ahh, toss in 6 or so banana skins -- works wonders with noisy differentials 1 Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted June 11, 2015 Author Share Posted June 11, 2015 Thanks guys Quote Link to comment Share on other sites More sharing options...
IanT90 Posted June 14, 2015 Share Posted June 14, 2015 Just changed my oil used mtf must admit was expecting miracles. In reality it has reduced gearbox noise but initial gear changes are now more crunchy than before I changed the oil. However it does improve after driving for a while. The oil did need changing it was black and gunky. But honestly can't say it's made any dramatic difference. Quote Link to comment Share on other sites More sharing options...
rick Posted June 14, 2015 Share Posted June 14, 2015 Just changed my oil used mtf must admit was expecting miracles. In reality it has reduced gearbox noise but initial gear changes are now more crunchy than before I changed the oil. However it does improve after driving for a while. The oil did need changing it was black and gunky. But honestly can't say it's made any dramatic difference. The friction modifiers can take up to 800km to flush the old ones out of the clutch hub faces and embed themselves when changing fluid types. Most specific modern manual trans fluids use special friction modifiers to enhance synchro performance, they generally exhibit a higher coefficient of friction with lowering rotational face speeds. Generally speaking a lower viscosity fluid aids shiftability, particularly at low ambients/operating temps, but higher viscosity fluids protect bearings and gears better than lower viscosity ones. This doesn't take into account the additive package and base oils, which can totally change the outcome, nor does it take into account higher operating temps where the low visc fluid may become too thin and synchro clutch baulking may result. I've had this happen with a premium 75W-85 (11.9cSt@100*C) MTF oil in high ambient/high load situation in an R380. I'd hate to think what it would've been like with an ATF. Quote Link to comment Share on other sites More sharing options...
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