Aren't there problems with using GL-5 oil (Mobil 1) if tranny uses GL-4? (more)
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Aren't there problems with using GL-5 oil (Mobil 1) if tranny uses GL-4? (more)
I saw on Redline's website that it reduces the tranny's life in half... is this true?
I'm still not sure whether to use Mobil 1 Syth Gear Lubricant or Redline MT90 and 75w90 for tranny/final drive.
Also, I may be misunderstanding something, but will the dealer both replace the tranny/final drive with either of the 2 oils? Thanks!
Edwin
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I'm still not sure whether to use Mobil 1 Syth Gear Lubricant or Redline MT90 and 75w90 for tranny/final drive.
Also, I may be misunderstanding something, but will the dealer both replace the tranny/final drive with either of the 2 oils? Thanks!
Edwin
225 ttc
"Got TT?"
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from the Mobil 1 website
Mobil 1 Synthetic Gear Lubricant is suitable for all automotive applications where lubricants meeting API Service GL-5, are recommended. It can also be used in rear axles where an API Service GL-4 lubricant is recommended. It should not be used in any transmissions requiring an engine oil or automatic transmission fluid, or GL-4 performance level.
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But here's an excerpt from the REDLINE site...
GEAR AND SYNCHRONIZER WEAR PROTECTION
Most manufacturers of manual transmissions and transaxles recommend an 80W or 90W GL-4 lubricant. GL-5 gears oils which are required in hypoid differentials are not used in most synchromesh transmissions because the chemicals used to provide the extreme pressure protection can be corrosive to synchronizers, which are commonly made of brass or bronze. Typically, the use of a GL-5 lubricant in a synchromesh transmission will shorten the synchronizer life by one half. The extreme pressure requirements of spur gears and helical gears found in transmissions are not nearly as great as found in rear-wheel drive differentials. A GL-4 lubricant provides adequate protection for most manual transmissions, unless a unique design consideration requires the extra protection of a GL-5.
Most manufacturers of manual transmissions and transaxles recommend an 80W or 90W GL-4 lubricant. GL-5 gears oils which are required in hypoid differentials are not used in most synchromesh transmissions because the chemicals used to provide the extreme pressure protection can be corrosive to synchronizers, which are commonly made of brass or bronze. Typically, the use of a GL-5 lubricant in a synchromesh transmission will shorten the synchronizer life by one half. The extreme pressure requirements of spur gears and helical gears found in transmissions are not nearly as great as found in rear-wheel drive differentials. A GL-4 lubricant provides adequate protection for most manual transmissions, unless a unique design consideration requires the extra protection of a GL-5.
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