Differential oil
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- Posts: 699
- Joined: Mon Nov 04, 2002 7:22 am
Differential oil
Ok guys, time to change the diff in #9727, where the heck do you find 250 wt? Is there a better alternative, now 35 years since the spec? Michael Bayer
Hi Michael,
Look at this link:
http://www.tomyang.net/cars/ferrari.html?gearoil.htm
It's in the "tips" section of my website in under "lubrication."
There are a lot of opinions on the 250 wt. oil. Most people put 80-90 without problems. Some people feel that the 250 wt. was for high speed driving, and the heavier wt would not loose it's vicosity at the higher temps, while others feel that the thick oil also helps quiet the rear end and prevent leaks.
I found the penrite oil in 250 wt. so I went ahead and put it in my car and it seems to work fine. I'll be changing it soon to wash any more water out of my differential. It's long story, if you haven't read about it!
http://www.tomyang.net/cars/ferrari.html?ferrari248.htm
Tom
Look at this link:
http://www.tomyang.net/cars/ferrari.html?gearoil.htm
It's in the "tips" section of my website in under "lubrication."
There are a lot of opinions on the 250 wt. oil. Most people put 80-90 without problems. Some people feel that the 250 wt. was for high speed driving, and the heavier wt would not loose it's vicosity at the higher temps, while others feel that the thick oil also helps quiet the rear end and prevent leaks.
I found the penrite oil in 250 wt. so I went ahead and put it in my car and it seems to work fine. I'll be changing it soon to wash any more water out of my differential. It's long story, if you haven't read about it!
http://www.tomyang.net/cars/ferrari.html?ferrari248.htm
Tom
slippery subject
I was wondering about Engine Oil:
Manual(s) state use 10W-50
but hard to find
I substituted 20W-50
with the following rationale
Manual shows that viscosity
suitable for temp range down to 5°F:
as I will not drive of start the car
when it is that cold (32°F minimum)
20W should be OK
other than that
the dange with stiffer oil
is that the oil cooler can burst
upon first start up
from over pressure
if too heavy oil is used:
should not be a prob
as the oil bypasses the cooler until hot (thermostat)
any sage words of wisdom?
is it worth (necesary) hunting down the 10W50?
(have not found any locally)
I have just been topping it off
I would like a final determination
by the time I have to change it
Manual(s) state use 10W-50
but hard to find
I substituted 20W-50
with the following rationale
Manual shows that viscosity
suitable for temp range down to 5°F:
as I will not drive of start the car
when it is that cold (32°F minimum)
20W should be OK
other than that
the dange with stiffer oil
is that the oil cooler can burst
upon first start up
from over pressure
if too heavy oil is used:
should not be a prob
as the oil bypasses the cooler until hot (thermostat)
any sage words of wisdom?
is it worth (necesary) hunting down the 10W50?
(have not found any locally)
I have just been topping it off
I would like a final determination
by the time I have to change it
Hi Fest,
I would worry more about the oil filter bursting before the oil cooler. I've seen this happen on three cars when starting in the winter. A no-name filter split at the case, and a Fram and a Bladwin sprayed oil out from the seal when the gasket failed. These filters are supposed to withstand a certain amount of pressure, but who knows what exactly happend. If you're going to drive your car in cold weather, it might make sense to use a lighter oil for winter months, but switch to the heavier oil in summer, but definitely keep and eye on your oil pressure when starting your car!!!
Tom
I would worry more about the oil filter bursting before the oil cooler. I've seen this happen on three cars when starting in the winter. A no-name filter split at the case, and a Fram and a Bladwin sprayed oil out from the seal when the gasket failed. These filters are supposed to withstand a certain amount of pressure, but who knows what exactly happend. If you're going to drive your car in cold weather, it might make sense to use a lighter oil for winter months, but switch to the heavier oil in summer, but definitely keep and eye on your oil pressure when starting your car!!!
Tom
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- Posts: 699
- Joined: Mon Nov 04, 2002 7:22 am
I too bought the Penright oil but chose not to use it after careful consideration. It is not appropriate for limited slip differentials. It is what they call steam oil and is really more appropriate for the chains on horseless carriages. Instead I used Redline high impact oil for the differential. This is a full synthetic and has all the additives for limited slips and has a viscosity of about 140. It is very satisfactory. Go to redline.com and you can look at all their oils.
Jim Burnett
Jim Burnett
newer diff
so what's to use in the 'later' Diffs
(I have 400i)
with indepenant rear suspension, posi, etc
Manual sez: 80W-90
is this 'off the shelf'
should I put in 'Limited Slip' Additive
(like from GM, Red Line?)
recommendations?
(I have 400i)
with indepenant rear suspension, posi, etc
Manual sez: 80W-90
is this 'off the shelf'
should I put in 'Limited Slip' Additive
(like from GM, Red Line?)
recommendations?
mobil the one
found this stuff:
http://www.mobil.com/USA-English/Lubes/ ... 80W-90.asp
sounds pretty good...
of course, they are the ones selling it ;)
I am a big fan of Mobil 1
(and use exclusively it in my late model commuter)
so, I should have no qualms about selecting their Gear lube, either
http://www.mobil.com/USA-English/Lubes/ ... 80W-90.asp
sounds pretty good...
of course, they are the ones selling it ;)
I am a big fan of Mobil 1
(and use exclusively it in my late model commuter)
so, I should have no qualms about selecting their Gear lube, either
Modern differential oils will have a limited slip additive in them. Look for a GL5 rating. Mobil 1 is great stuff. The 330 gt's have spiral bevel gears in the differential and later cars have Hypoid gears. You must use oil for hypoid differentials if that is what you have. It does not make a difference if you have a spiral bevel diff.
Jim Burnett
Jim Burnett
Jim's onto a good point. Hypoid gears work differently than regular spiral cut gears. From I research, hypoid gears do not intesect the crown gear in the middle (think of the crown gear as an "O") kind of like this: O- , but instead mesh with the crown gear lower down like this: O_ This offset give more clearance inside the car so the center tunnel is not as high, but there is more of a slipping action between the gears to make this happen. This added friction requires a special gear lube. That's why you see "hypoid gear oil."
My diff is a regular spiral cut, non limited slip rear, so it can use the heavier oil. If you have a hypoid, or limited slip, I would use something else.
Another piece of useless information that the rest of the world couldn't care less about!
Tom
My diff is a regular spiral cut, non limited slip rear, so it can use the heavier oil. If you have a hypoid, or limited slip, I would use something else.
Another piece of useless information that the rest of the world couldn't care less about!
Tom