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Correct me if I'm wrong... but synchromesh isnt gl4. Gl rating is a gear oil specification. Synchromesh isnt gear oil. Its a GM transmission product. If anything its closer to the atf family, if anything at all. Not saying its a bad product... want to put it in my mustang and all, just pretty sure its not gl4.


I stand corrected.

PENNZOIL« SYNCHROMESH MANUAL TRANSMISSION FLUID
Pennzoil« Synchromesh Fluid is a manual transmission fluid designed for certain manual transaxles and manual transmissions used by General Motors or Chrysler. Pennzoil« Synchromesh manual transmission fluid is formulated with high-quality paraffinic base stocks, a fluidity modifier, multifunctional performance additives, corrosion inhibitors, a foam suppressor and a shear stable viscosity index improver additive. It provides excellent oxidation stability, low-temperature performance, excellent synchronizer performance and compatibility with yellow metals, such as bronze, brass and copper components found in manual transaxles and transmissions. Synchromesh manual transmission fluid will satisfactorily lubricate General Motors or Chrysler manual transaxles and transmissions from -40 C to +150 C.

I do use it on both my KM145 and V5MT1

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