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Open Roads Forum  >  Class A Motorhomes

 > Good quality synthetic rear differential gear oil

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bluebarry1964b

Homestead, Florida

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Posted: 06/22/12 08:59pm Link  |  Print  |  Notify Moderator

It's time to change the oil in my rear differential. My manual says that I'm supposed to use Pennzoil 75w90 synthetic gear oil for my rear differential (2003 Holiday Rambler Neptune). I haven't found any, and have been looking in stores, online, etc, for a good quality 75w90 synthetic oil. The cheapest I've found so far is going to run me about $8.90/quart, buying it in gallon jugs. I'm needing 16 quarts, so I'm trying to find a better deal than $8.90. Quality is more important than price, though, but I was hoping to find a better deal. Any ideas?

rvrepairnut

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Posted: 06/22/12 09:42pm Link  |  Print  |  Notify Moderator

bluebarry1964b wrote:

It's time to change the oil in my rear differential. My manual says that I'm supposed to use Pennzoil 75w90 synthetic gear oil for my rear differential (2003 Holiday Rambler Neptune). I haven't found any, and have been looking in stores, online, etc, for a good quality 75w90 synthetic oil. The cheapest I've found so far is going to run me about $8.90/quart, buying it in gallon jugs. I'm needing 16 quarts, so I'm trying to find a better deal than $8.90. Quality is more important than price, though, but I was hoping to find a better deal. Any ideas?


I find it hard to beleive a 2003 Manual actually names a brand? but all that aside any synthetic 75-90 GL5 hypoid gear oil will work just fine

MARKW8

Akron OH

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Posted: 06/22/12 09:46pm Link  |  Print  |  Notify Moderator

Try a truck stop/ truck repair shop for gallons. Or order online.

Mark

agesilaus

North Florida

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Posted: 06/22/12 09:50pm Link  |  Print  |  Notify Moderator

Lots of people use Amsoil


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rvrepairnut

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Posted: 06/22/12 10:24pm Link  |  Print  |  Notify Moderator

agesilaus wrote:

Lots of people use Amsoil

one of the worst over rated gears oil of all time

old guy

Oregon (pronounced Or e gun)

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Posted: 06/22/12 11:54pm Link  |  Print  |  Notify Moderator

do you have jiffy lube stations in your area. they use Pennzoil at their places of business

lirv

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Posted: 06/23/12 04:06am Link  |  Print  |  Notify Moderator

Delvac 1 is an excellent stnthetic gear lube. Most truck shops carry it. It is original fill in many truck differentials.


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DavidP

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Posted: 06/23/12 04:23am Link  |  Print  |  Notify Moderator

Mobil 1 75/90 is also a very good synthetic.

Captain_Happy

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Posted: 06/23/12 05:23am Link  |  Print  |  Notify Moderator

I wouldn't be using sythesia oil in my rear end after what my mechanic told me about how thin this kind of oil can get when it gets hot. It doesn't stick to the drive shafts long enough to get to the outer wheel bearings. He ought to know, he works on these things.

Weathertodd221

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Posted: 06/23/12 05:55am Link  |  Print  |  Notify Moderator

Captain_Happy wrote:

I wouldn't be using sythesia oil in my rear end after what my mechanic told me about how thin this kind of oil can get when it gets hot. It doesn't stick to the drive shafts long enough to get to the outer wheel bearings. He ought to know, he works on these things.


I find that amusing. If distribution is a problem... what leads him to believe conventional is any better than synthetic?

He "oughta" know isnt a very high standard with which to set a benchmark...lol

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