Stock JK Tech Bulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer. Show Accidently mixed 75W-90 with 75W-140.. is that ok? JK Enthusiast Thread Starter
Join Date: Jul 2009 Location: Smithtown, NY Posts: 215 Likes: 0 Received 0 Likes on 0 Posts Changed my diff fluids yesterday. I accidently mixed 75W-90 gear oil with 75W-140 gear oil in my rear diff (put about 1 qt of each in). Both are Mobil 1 brand.. is this ok? I don't have the tow package. I made sure to only put 75w-90 in my front diff though. JK Jedi Master
Join Date: Feb 2008 Location: Maine Posts: 12,806 Likes: 0 Perfectly OK. JK Freak
Join Date: Jul 2009 Location: State College, PA Posts: 590 Likes: 0 Received 1 Like on 1 Post No problem at all! I am a mechanical/petroleum engineer and can tell you that you are probably running ~75W-115 because the only difference between 75W-90 and 75W-140 is the amount of viscosity modifiers (polymers that stretch out and make the oil more viscous at high temps). Since the rear D44 can take 75W-90 or 75W-140 (specified for towing applications) you are perfectly fine to have something in the middle. If you are towing you may want to change to pure 75W-140 just for the most protection but if you aren't doing hardcore towing you just have a little added protection over the minimum recommended viscosity (mainly specified that low to try to squeeze every bit of mpg out of the JKs possible). JK Newbie
Join Date: Feb 2009 Location: Ripley,WV Posts: 52 Likes: 0 Received 0 Likes on 0 Posts No Problem if the oils are the same brand. JK Junkie
Join Date: May 2009 Location: Denton, TX Posts: 3,074 Likes: 0 Received 1 Like on 1 Post x3 or 4, its fine. JK Jedi Master
Join Date: Feb 2008 Location: Maine Posts: 12,806 Likes: 0 Quote: Originally Posted by ronjenx Perfectly OK. Quote: Originally Posted by tpm152 No problem at all! I am a mechanical/petroleum engineer and can tell you that you are probably running ~75W-115 because the only difference between 75W-90 and 75W-140 is the amount of viscosity modifiers (polymers that stretch out and make the oil more viscous at high temps). Since the rear D44 can take 75W-90 or 75W-140 (specified for towing applications) you are perfectly fine to have something in the middle. If you are towing you may want to change to pure 75W-140 just for the most protection but if you aren't doing hardcore towing you just have a little added protection over the minimum recommended viscosity (mainly specified that low to try to squeeze every bit of mpg out of the JKs possible). Yeah, that's what I meant to say!! JK Enthusiast Thread Starter
Join Date: Jul 2009 Location: Smithtown, NY Posts: 215 Likes: 0 Received 0 Likes on 0 Posts sweet. Thanks for the responses JK Newbie
Join Date: Jan 2010 Location: Thousand Oaks, CA Posts: 78 Likes: 0 Received 0 Likes on 0 Posts Quote: Originally Posted by dirtyjkwrangler Changed my diff fluids yesterday. I accidently mixed 75W-90 gear oil with 75W-140 gear oil in my rear diff (put about 1 qt of each in). Both are Mobil 1 brand.. is this ok? I don't have the tow package. I made sure to only put 75w-90 in my front diff though. As per the 2010 Wrangler owner's manual Axle Differential (Rear): 226 RBI (Model 44) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
What is 75WSAE 75W-140, API GL-5 is typically used as service fill rear axle oil for many passenger cars and trucks with high loads or very high horsepower. The higher viscosity base stocks help protect gears by maintaining the oil film in addition to the extreme pressure agents used to reduce metal to metal wear.
Can I use 85w140 instead of 75W90?No. Only use the recommended viscosity only. Now if you could get synthetic 85W-140, that would be OK. But 75W-90 will shorten the transmissions life over time.
When should I use 140 gear oil?For competition, consistent high temperature or extreme high load operation, fully synthetic Pro Gear 80W-140 should be used.
Is 75W75W140 Full Synthetic Gear Oil
VPS 75W-140 Gear Oil is a superior sulfur-phosphorus extreme pressure gear lubricant formulated with synthetic base stocks and additives to provide excellent performance.
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Can you use 75w140 instead of 75w90
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