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Any auto supply store carries, these transmission gear oil. My smart car service adviser, recommend these. He used them in all 3 of his smart car. They been fine in my car, for 60K miles.

 

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On my first 451 I changed to Valvoline SynPower in 75w-140. That got rid of some of the clunk on the gears and the shifting was much improved. Just remember to squeeze and "jam" the bottle in between the spring coils... ...tada!
 
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