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Discussion Starter · #1 ·
Since I omitted replacing my g

Since I omitted replacing my gear oil plug washer and it resulted in a leak I will be replacing my gear oil again

Originally it had Mobil 1 in it as the wrench replaced all the bearings and seals in '96, the last owner had it serviced and they put regular Quaker gear oil in it with Slick 50 additive, my concern was if I went back to Mobil 1 I may get seal leaks, I changed to regular Valvoline gear oil but it doesn't seem to shift as smoothly.

Any opinions on putting in Mobil 1 again resulting in possible leaks or trying a different brand full synthetic?

Thanks
 
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Discussion Starter · #2 ·
Jeff,
I had problems with th


Jeff,
I had problems with the Mobil 1 in my 328. After about 8k miles the synchros started acting up and "crunching", and then the diff started chattering, on tight, parking lot turns. I switched to Redline 75w-90 NS synthetic, and all is well....for now. And the cold second gear thing went away, too.
 
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Discussion Starter · #3 ·
It seems like good results are

It seems like good results are being reported by users of Redline & Royal Purple.

Wondering if anyone has tried Swepco recently?
 
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Discussion Starter · #4 ·
JRV, I used it in my previous

JRV, I used it in my previous 308. Worked fine, but did nothing for the cold 2nd gear syndrome. But was otherwise fine.
 
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Discussion Starter · #5 ·
Well, this weekend I noticed j

Well, this weekend I noticed just a little bit of chattering in the rear end(much less than when I had the Mobil 1), when making a tight parking lot turn (90 degrees) and pretty hard on the gas. Not a huge deal, so I am not rushing to put in the additive....Have not noticed this in normal or spirited driving on the road yet.
 
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Discussion Starter · #6 ·
Dave,

I'd put the addi


Dave,

I'd put the additive in before the plates start chattering worse. Usually by the time you can feel them going slow the chatter almost never goes away, additive or not.

Regards, JRV
 
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Discussion Starter · #7 ·
Okay, will take your advice an

Okay, will take your advice and get the additive and put it in.
 
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Discussion Starter · #8 ·
From what I gather from Fchat,

From what I gather from Fchat, Mobil1 is (generally) 10W30, therefore much much thinner, especially when the car is cold. This would explain the leaks you have. Redline 75w90 is much more viscous.

That said, as an engineering, I don't understand why a seal wouldn't fullfill its role: preventing leak without consideration of the oil behind...
 
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Discussion Starter · #9 ·
Mobil 1 gear oil is 75W-90. th

Mobil 1 gear oil is 75W-90. the 10-30 is engine oil, although it's lighter than I would use in a Ferrari. Mobil 1 15-50 is a better choice for engine oil.
 
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Discussion Starter · #10 ·
Then here is my next question:

Then here is my next question: what would make Mobil 1 75W90 more leaky than Redline 75W90. Per denomination, specifications should be the same. What is the difference?
 
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Discussion Starter · #11 ·
JRV,
I just got off the phone


JRV,
I just got off the phone with "Dave" at Redline technical services, and his advice was to not use the additive if the chatter was not severe (it isn't, I only noticed it two times, both when making a 90 degree turn from a stop, and hard on the throttle). He says that it is mostly an annoyance, and should not get worse. He says if I must, just add around 1% of the additive, which he calculates to be around .6 of an ounce in the 4 quarts a 328 holds. He says the synchos don't like the additive, and the limited slip does, so it is a delicate balance, and he prefers to favor the synchos over the limited slip, that the chatter is not destructive. Your comment seems to disagree with that,...Me? I don't know, but am starting to lean toward adding the additive..as I don't wish to mess anything up.
 
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Discussion Starter · #12 ·
Dave,

to date with more tha


Dave,

to date with more than 25 yrs under my belt I have yet to have seen an oil related trans failure. In fact I have seen very few trans failures at all, and of those most were due to old age and plenty of miles, the rest to abuse.

I personally think that Lmtd Slips need Lmtd Slip additive, I think Ferrari knew this when designing the tranny's or if they didn't they felt the lmtd slips would be fine, and for the most part they are, however GM realized that Lmtd Slips could and did chatter from even early going low miles situations and invented the most widely known & used Lmtd Slip additive to reduce/eliminate this chatter. It worked so well in fact that almost every old timer adopted the technique of adding the GM product to all their cars that needed it. None of this adding for the last 25 or more years resulted in ant different shifting whatsoever, only reduced chatter .

So what we have here is micro analysis of possibilities (remote possibilities at that) on one hand, and the vast amount of experience of techs in the field on the other. So now that we are all given choices we can all feel free to choose the option that best suits our needs or driving styles.

Regards, JRV
 
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Discussion Starter · #13 ·
I'm convinced! I will buy

I'm convinced! I will buy some and add a little bit and drive it for a while, and see if a bit more is needed. Sounds like add just enough, and no more.
 
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Discussion Starter · #14 ·
Dave,
Although it has been ma


Dave,
Although it has been many years since I had my 328, I remember hearing a slight amount of diff chatter after a gearbox oil change. At that point in time, we we're using Penzoil 4086/4096 EP 80-90 GL-5 gear oil in our shop. One of our old timers, a past GM tech from a previous life suggested trying a bit of GM posti-traction additive. I can't remember how much we added, but do remember that it did cure the chatter.

Interestingly enough, no matter what type of gear oil I've running in the BB, I've never had any diff chattering issues. Then again, the BB has the turning radius of a school bus, so tight turns are near impossible....

Regards,
David
 
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Discussion Starter · #15 ·
JRV,
Got the additive yesterd


JRV,
Got the additive yesterday, and plan to add it on Saturday. Okay to add this through the top fill on the clutch housing area? Or do I need to do it through the top of the diff directly? I guess I figure it will be easier through the former, than the later, and less likely to spill; so just wondering if I will hurt anything....
 
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Discussion Starter · #16 ·
Dave,

you can add it thru


Dave,

you can add it thru the transfer gear filler, no harm, it will settle and mix either way.

Best, JRV
 
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Discussion Starter · #17 ·
Thanks man,
I will go into th


Thanks man,
I will go into this with more confidence now...

Oh, and a correction, Redline recommends only .5% additive, which is around .6 of an ounce. He was very concerned to start low, and add a bit more only if necessary to minimize the chance of upsetting the synchros with too slippery a mix. If you use their standard 75w-90 synthetic fluid, it has 4% slip additive, which he says is WAY too much for the synchros, and will cause crunching. He thinks the ideal amount will be between .5% and 1%.
 
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Discussion Starter · #18 ·
Okay, it's in...but crap,

Okay, it's in...but crap, the weather just sucks out tonight...and it will be hard to test the diff, since it is so wet out, I will only induce wheel spin....supposed to dry out in a day or two, and I will be out for a drive for sure!
 
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Discussion Starter · #19 ·
Okay gents, I took the 328 out

Okay gents, I took the 328 out for a drive, put on about 20+ miles, and then did a few 90 degree turns from a stop, hard on the throttle to see if I could induce any chatter from the diff. I could barely perceive just a tad. Did this four times to be sure. I added one tablespoon of the slip additive, which should be about .5%. Perhaps another tablespoon (1%) would be better, but I will drive the car a bit, and put some more miles on before deciding. For now, I could live with it, since it is so minor, and I have to "create" the situation, when it chatters, if even so slightly now.
 
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Discussion Starter · #20 ·
>>I added one tablespo

>>I added one tablespoon of the slip additive, which should be about .5%. Perhaps another tablespoon (1%) would be better<<

I'm from the generation of: If one tablespoon is good, two is probably better...{
}

Regards, JRV
 
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