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Mustang Forums
2015+ S550 Mustangs
Drivetrain Modification/Discussion
Change in Gear Oil Spec for 2015 Mustangs
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<blockquote data-quote="gqneon" data-source="post: 14882808" data-attributes="member: 172453"><p>This is an interesting read - I'm glad you posted this. I am adding a blower and this is such an easy swap, I only need a couple quarts and it would be a good investment. </p><p></p><p>Is there any downside to moving to a 75W-140 from 75W-85 other than fuel economy potentially? I'm just wondering if there's small ports or areas or something that would make Ford engineers who built these cars to run such a lightweight lube in the rear (maybe the Torsen Limited Slip unit needs lighter gear lube?) I don't know, and I'm not pretending to be an engineer to say which is better. The logic of better economy trumping all in production cars makes perfect sense in a marketing perspective, so I buy that part. </p><p></p><p>To me it sounds like very smart and cheap insurance until I get my blower bolted on. Can anyone think of a reason not to do so? </p><p></p><p>And if I do, do I need to add more friction modifier to the rear end after draining it? Shop manual says so, but it also says to run 75/85. And if I need to do so, can I run Amsoil additive or is it substantially different from Fords?</p><p></p><p>For reference the manual says:</p><p></p><p>"Fill the differential with 4.0 oz (0.118 L) of clean friction modifier. </p><p>Material: Motorcraft® Additive Friction Modifier (U.S.) / XL-3 (U.S.) (EST-M2C118-A)"</p></blockquote><p></p>
[QUOTE="gqneon, post: 14882808, member: 172453"] This is an interesting read - I'm glad you posted this. I am adding a blower and this is such an easy swap, I only need a couple quarts and it would be a good investment. Is there any downside to moving to a 75W-140 from 75W-85 other than fuel economy potentially? I'm just wondering if there's small ports or areas or something that would make Ford engineers who built these cars to run such a lightweight lube in the rear (maybe the Torsen Limited Slip unit needs lighter gear lube?) I don't know, and I'm not pretending to be an engineer to say which is better. The logic of better economy trumping all in production cars makes perfect sense in a marketing perspective, so I buy that part. To me it sounds like very smart and cheap insurance until I get my blower bolted on. Can anyone think of a reason not to do so? And if I do, do I need to add more friction modifier to the rear end after draining it? Shop manual says so, but it also says to run 75/85. And if I need to do so, can I run Amsoil additive or is it substantially different from Fords? For reference the manual says: "Fill the differential with 4.0 oz (0.118 L) of clean friction modifier. Material: Motorcraft® Additive Friction Modifier (U.S.) / XL-3 (U.S.) (EST-M2C118-A)" [/QUOTE]
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2015+ S550 Mustangs
Drivetrain Modification/Discussion
Change in Gear Oil Spec for 2015 Mustangs
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