4 speed- yellow metals
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The following 2 users liked this post by crb2855:
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I asked Baker engineering if the Spectro Heavy trans oil they sell is compatible with the older 4 speeds trans (I have some for my 6 speeds) because of bronze bushings and they said it would not harm them. It's a GL5 oil but they said no problem. Some manufacturers say that oil companies claim their oils have buffered sulfur and are not corrosive to yellow metals. Note the "some", so I'd be careful and check with the manufacturer for other trans oils.
A wise man on this forum told me to use 60 weight valvoline syn and 25 percent of Lucas oil stabilizer. Other than the stabilizer, that's about what I've run in the 4 speeds for more than 40 years, straight weight non sythentic trans oil.
Paul
A wise man on this forum told me to use 60 weight valvoline syn and 25 percent of Lucas oil stabilizer. Other than the stabilizer, that's about what I've run in the 4 speeds for more than 40 years, straight weight non sythentic trans oil.
Paul
The following 2 users liked this post by pgreer:
bulldog1776 (07-31-2024),
FLHS1990 (08-02-2024)
#5
When the 4 speed was invented the motor company used the same oil that was in the engine we have used this type oil since it came along and 25 thousand miles is the life of a Harley 4 speed - this oil has been my go to for many many years valvoline vr synthetic 60 weight
its 10 bucks a quart - you need to spend 20 or 25 a quart hey go for it but we do 75 some years others 100 4 speeds and they dont come back with issues
now the magic oil is in the ones leaking like a lumber truck - but what do i know
its 10 bucks a quart - you need to spend 20 or 25 a quart hey go for it but we do 75 some years others 100 4 speeds and they dont come back with issues
now the magic oil is in the ones leaking like a lumber truck - but what do i know
The following 4 users liked this post by johnjzjz:
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I asked Baker engineering if the Spectro Heavy trans oil they sell is compatible with the older 4 speeds trans (I have some for my 6 speeds) because of bronze bushings and they said it would not harm them. It's a GL5 oil but they said no problem. Some manufacturers say that oil companies claim their oils have buffered sulfur and are not corrosive to yellow metals. Note the "some", so I'd be careful and check with the manufacturer for other trans oils.
A wise man on this forum told me to use 60 weight valvoline syn and 25 percent of Lucas oil stabilizer. Other than the stabilizer, that's about what I've run in the 4 speeds for more than 40 years, straight weight non sythentic trans oil.
Paul
A wise man on this forum told me to use 60 weight valvoline syn and 25 percent of Lucas oil stabilizer. Other than the stabilizer, that's about what I've run in the 4 speeds for more than 40 years, straight weight non sythentic trans oil.
Paul
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