Scuderia New Member 8 Member For: 5y 17d Location: Sydney, NSW Posted 03/05/20 06:21 AM Share Posted 03/05/20 06:21 AM Hey all, Was wondering, is the stock ZF transmission cooler the culprit for causing the ZF to milkshake (the image below)? Is it because the coolant and transmission fluid run through this heat exchanger, and as it breaks down this is where to 2 fluids mix causing it to milkshake? If so, would it better to change the stock transmission cooler every 80,000kms with another genuine one? Or install a PWR heat exchanger? Cost isn't a problem but which would be better in the long run? Cheers Link to comment Share on other sites More sharing options...
cat007 Member 236 Member For: 6y 6m 18d Posted 03/05/20 06:27 AM Share Posted 03/05/20 06:27 AM Yes.Remove and go air to oil.No chance of milkshake. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,331 Member For: 16y 11m 13d Gender: Male Location: Melbourne Posted 03/05/20 06:36 AM Share Posted 03/05/20 06:36 AM On 03/05/2020 at 6:21 AM, Scuderia said: Is it because the coolant and transmission fluid run through this heat exchanger, and as it breaks down this is where to 2 fluids mix causing it to milkshake Expand Exactly... the small bit of metal between the two fluids can rust due to the coolant running through it (mostly) and this causes the oil on the other side to mix into the coolant and vice-versa... it's a bit expensive failure of both the gearbox and engine cooling system at once. it is better to remove the stock heat exchanger entirely but you can change it every 50k km's (conservative compared to your 80k estimate, but both "should" be fine...) and still avoid this problem. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 4m 24d Gender: Male Location: Perth Posted 03/05/20 06:44 AM Share Posted 03/05/20 06:44 AM (edited) Stray currents, old coolant, vibration. Mine is rubber mounted. Edited 03/05/20 06:46 AM by arronm Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,331 Member For: 16y 11m 13d Gender: Male Location: Melbourne Posted 03/05/20 06:53 AM Share Posted 03/05/20 06:53 AM yes, stray currents can cause coolant to speed up it's wearing away at the surface, so can stray oxygen (but there should be very little of that) and vibrations just cause the minor damage done to speed up marginally... But I doubt that vibrations would ever cause it on their own, either for stray current... Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 4m 24d Gender: Male Location: Perth Posted 03/05/20 07:10 AM Share Posted 03/05/20 07:10 AM Electrolysis. Link to comment Share on other sites More sharing options...
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