Originally Posted By: lexus114
Which is fine dont get me wrong.But I believe the real necessity for Synthetic oil is in the transmission/Transaxle.Here on bitog we all pretty well know by now an engine will go thousands of miles on conventional motor oil.The transmissions are another story,I believe they really benefit from synthetic fluid due to their high heat operating temps,and a transmissions biggest enemy is heat.The first thing I usually always do to an automobile is an atf cooler,synthetic fluid,and filter.My latest observation is my Asian Werner U-140 F.Synthetic fluid made a world of difference in this transaxle.
I disagree... The reason engines go further than your average transmission is because of design not the fluid.
Now using a Syn will definitly help extend a transmissions life, but the real way to get it to last a long time is to keep it cool using an external cooler and also use an external filter like a Magnefine to help keep the internal filter free/clear.
In all the cars I have driven to 400K+ KM (240K Miles) all have been the original transmission using dino based transmission fluids. But all also had regular service of no more than 50K KM (30K miles) with fresh fluid and filters, and all but 1 had an external transmission cooler installed if not already equipped.
Heat kills a transmission, not fluid choices or brands so long as it's the correct specification!