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Discussion Starter · #1 ·
Hi,

I've been searching and reading this forum, and I've read the owner's manual. I think I have a 451. What exactly is the transmission fluid(s) that I can use? My car is at 30K miles.

Thanks.
 

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2009 451 Rally Red, Pennzoil Platinum Euro 5W-40, Wix XP 51356, 185/55R15 tires, 44 psl
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Look here...


Transmission requires a GL-4 gear oil, lots of choices.

Do not use a GL-5 gear oil, it is not friendly to yellow metals...
 

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Discussion Starter · #3 ·
Look here...


Transmission requires a GL-4 gear oil, lots of choices.

Do not use a GL-5 gear oil, it is not friendly to yellow metals...
I've read that post. But I have an automatic transmission, not a manual transmission.
 

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OK, got you. Thanks for the clarification.
The recommended transmission oil is Full Synthetic Mobil1. Cheapest at Costco. I have also used Lucas Full Synthetic transmission oil. The correct name is Transaxle Oil or Fluid. By the way, Costco also carries Full Synthetic Engine Oil less expensive.
 

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2009 451 Rally Red, Pennzoil Platinum Euro 5W-40, Wix XP 51356, 185/55R15 tires, 44 psl
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Mobil 1 Full Synthetic 75W-90 gear oil is GL-5, and it is limited slip...
 

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Costco does not have gear oils, they got Mobil 1 engine oil at great price. I would consider Redline 75W-90 gear oil if one wants to replace it. No sure why you want to change gear oil? Got > 500k miles on your Smart? that may justify changing gear oil.
 

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2009 451 Rally Red, Pennzoil Platinum Euro 5W-40, Wix XP 51356, 185/55R15 tires, 44 psl
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Service manual says change transmission oil every 30,000 miles...
 

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It should read 300,000 miles! BIG money maker for MB service department. If you have leased Smart car you may follow such recommendation. I would ignore it, car's transmission is manual with automated clutch. You do not change transmission fluid on other cars with automatic transmissions at such frequency. Do some research, before panic time.
 
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