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Old 06-10-2013, 05:00 PM
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Synthetic Oil

Okay so I will be doing an oil change on my OBS this weekend. As long as I have owned it I have run Rotella 15w-40 in it with the FL-1995 Motorcraft filer. This time I plan to change to Amsoil 15w-40 synthetic.

AMSOIL SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil

My first question is, do I need to empty the HPOP reservoir as well as the pan as to not mix synthetic with conventional or does that matter. Secondly should I use an Amsoil filter or will the FL-1995 filter work?

Lastly I also plan to service the rear end at the same time (going to put an 08 aluminum cover one too) and plan to switch to synthetic. I have the 10.25 obviously with 4.10's and the door tag says its an open diff. There are 4 different options listed for the rear end oil so my question is which one should I run?

SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)

Thanks for any help you guys can give!

-Tim
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Old 06-10-2013, 05:07 PM
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Just discovered the Amsoil Ea filters. Its pricey but I think I might run that, as I am sure it is designed for the oil. Only makes sense to me.
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Old 06-10-2013, 05:18 PM
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i didn't drain the HPOP reservoir there will still be conventional oil in the rails, so there will still be "contamination" though draining and refilling the reservoir is one more old quart out and new one in.

rear end i used amsoil 75-90 severe gear or 75-140 if you tow heavier and more often
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Old 06-10-2013, 05:26 PM
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Thanks for the info Terry. Yeah it tows almost every day now 6-10k. That is one of the reasons I am upgrading all of the fluids to synthetic.


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Old 06-10-2013, 05:33 PM
the baconator
 

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i believe the rear already has synthetic from the factory
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Old 06-10-2013, 05:52 PM
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Quote:
Originally Posted by terryknight View Post
i believe the rear already has synthetic from the factory
Really? I would have never guessed.

Just realized how sarcastic that sounded.

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Old 06-10-2013, 06:23 PM
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Just out of curiosity ( I don't know much about this stuff) what is the real difference between the 75-90 and 75-110?


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Old 06-10-2013, 06:24 PM
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Don't matter bout old oil getting in with your new synthetic, like terry said its gonna happen, for the rear I used royal purple 75w140, I have limited slip and this keeps from adding the traction modifier too, ended up costing close to the same as amsoil plus the modifier
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Old 06-10-2013, 06:27 PM
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AMSOIL is compatible with conventional oils, however it will effect the drain interval. If you keep the first change on the conservative side there should be no problems. The synthetic with the Ea filter will allow extended drain intervals.

Do yourself and your wallet a favor and become a preferred customer for a $10.00 investment/six month membership you will purchase at wholesale pricing. You will make you money back and then some with this oil change.

For the gear oil, I agree with Terry. AMSOIL has an excellent vehicle look-up guide on their main web page for all recommended products. If you want a price break down between the two let me know.
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Old 06-10-2013, 06:29 PM
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[QUOTE=01Crewcab7.3;5576426]Just out of curiosity ( I don't know much about this stuff) what is the real difference between the 75-90 and 75-110?


110 is a heavier/thicker grade than the 90.
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