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Which one would you trust?

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Old 02-24-2008, 11:57 PM
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Default Which one would you trust?
Alright gentlemen and ladies if there are any,

Who would you trust when it comes to the differential gear oil? I have 3 different sources, and I'm not sure which one to go with:

The official Ram service manual says:
Front Axle:SAE 75W-140 SYNTHETIC
Rear Axle: Thermally StableSAE 80W-90 or SAE 75W-140 SYNTHETICfor HD/towing applications

Amsoil's reference says:
Front Axle: SAE 80W-90 SYNTHETIC, Severe Gear 75W-90, or SAE 75W-90 SYNTHETIC
Rear Axle: Severe Gear 75W-90, SAE 75W-90 SYNTHETIC, or Severe Gear 75W-110

Royal Purple's reference says:
Front/Rear Axle: SAE 75W-90 SYNTHETIC
(no mention of different weight for towing)

I will be doing SOME towing but not constantly...

[sm=feedback.gif]
 
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Old 02-25-2008, 12:03 AM
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Default RE: Which one would you trust?
I used 75w-90 Coastal brand in mine today when I changed mine out this afternoon, because I only tow a trailer two or three times a year also.
 
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Old 02-25-2008, 12:23 AM
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Default RE: Which one would you trust?
I saw that Coastal at Autozone, but I really don't like to use cheap brands unless I am changing it often. Since I won't be changing the diffs again for another 36K, I want to put a good synthetic in it...[8D]
 
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Old 02-25-2008, 12:31 AM
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Default RE: Which one would you trust?
ORIGINAL: Ram2K1

Alright gentlemen and ladies if there are any,

Who would you trust when it comes to the differential gear oil? I have 3 different sources, and I'm not sure which one to go with:

The official Ram service manual says:
Front Axle:SAE 75W-140 SYNTHETIC
Rear Axle: Thermally StableSAE 80W-90 or SAE 75W-140 SYNTHETICfor HD/towing applications

Amsoil's reference says:
Front Axle: SAE 80W-90 SYNTHETIC, Severe Gear 75W-90, or SAE 75W-90 SYNTHETIC
Rear Axle: Severe Gear 75W-90, SAE 75W-90 SYNTHETIC, or Severe Gear 75W-110

Royal Purple's reference says:
Front/Rear Axle: SAE 75W-90 SYNTHETIC
(no mention of different weight for towing)

I will be doing SOME towing but not constantly...

[sm=feedback.gif]
When in doubt use The official Ram service manual says:
Front Axle:SAE 75W-140 SYNTHETIC , same for the rear axle,
advanceautoparts has mobil gear syn 75w-140 15.50 QT.
 
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Old 02-25-2008, 12:35 AM
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Default RE: Which one would you trust?
ORIGINAL: padodgeram

ORIGINAL: Ram2K1

Alright gentlemen and ladies if there are any,

Who would you trust when it comes to the differential gear oil? I have 3 different sources, and I'm not sure which one to go with:

The official Ram service manual says:
Front Axle:SAE 75W-140 SYNTHETIC
Rear Axle: Thermally StableSAE 80W-90 or SAE 75W-140 SYNTHETICfor HD/towing applications

Amsoil's reference says:
Front Axle: SAE 80W-90 SYNTHETIC, Severe Gear 75W-90, or SAE 75W-90 SYNTHETIC
Rear Axle: Severe Gear 75W-90, SAE 75W-90 SYNTHETIC, or Severe Gear 75W-110

Royal Purple's reference says:
Front/Rear Axle: SAE 75W-90 SYNTHETIC
(no mention of different weight for towing)

I will be doing SOME towing but not constantly...

[sm=feedback.gif]
When in doubt use The official Ram service manual says:
Front Axle:SAE 75W-140 SYNTHETIC , same for the rear axle,
advanceautoparts has mobil gear syn 75w-140 15.50 QT.
Yeah, I was thinking, going with the service manual would be smart I guess. I don't have Advance here, but the Mobil 1 is $16.99/qt at Autozone. However, here on base, I can get either RP 75W-90 or RP 75W-140 for $11.35/qt. Not sure if I should use -140 in the rear, since I won't be towing a lot.
 
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Old 02-25-2008, 01:01 AM
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Default RE: Which one would you trust?
I would go with royal purple they seem to know what they're doing. On Horsepower Tv this weekend an engine picked up 8hp on an engine dyno just by changing from a general oil brand to royal purple.

They also pointed out that the w doesn't actually stand for weight it stands for winter viscosity. Just thought that was interesting i always thought it stood for weight.
 
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Old 02-25-2008, 01:21 AM
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Default RE: Which one would you trust?
ORIGINAL: sbrunn9

I would go with royal purple they seem to know what they're doing. On Horsepower Tv this weekend an engine picked up 8hp on an engine dyno just by changing from a general oil brand to royal purple.

They also pointed out that the w doesn't actually stand for weight it stands for winter viscosity. Just thought that was interesting i always thought it stood for weight.
Yeah, being able to get the RP for about $5 less per quart than the Mobil...I'd be crazy not to... I also saw that on HP TV this weekend. I was amazed that engine oil could give 8HP, but I think with our engines it would be more like 2-4HP...
 
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Old 02-25-2008, 01:27 AM
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Default RE: Which one would you trust?
i just put in regular Valvoline SAE 80W-90, because i didnt feel like dropping another 10 bucks a quart, plus all i tow is a 14ft boat and a 2place trailer during the seasons so the 140 didnt make since. but if you can get the RP for 11 buck id go with the 70-90
 
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Old 02-25-2008, 01:36 AM
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Default RE: Which one would you trust?
I don't really want to go with anything other than 75W-140 in the front, since that is what the service manual calls for...the rear is up the air. It would be easier to go -140 in both the front and rear. That way I only have to buy 5 qts of -140 instead of 3 qts of -90 and 3 qts of -140. Make sense?
 
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Old 02-25-2008, 02:57 AM
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Default RE: Which one would you trust?
If your running open diffs (No locker or limited slip) id run the 80w-90. if you have lockers however i suggest running the 75w-140. I run front and rear lockers in my Jeep and both of their manuals spec the heavier weight oil due to more moving parts.
 
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