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Old 02-02-2011, 12:10 PM
jack7481 jack7481 is offline
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Default back and front diff.oil

This spring I am going to change the back cover on the diff. with one that has a drain hole,clean out the front diff. and add 100% synthetic valvoline sny power gear lube.As for what weight the book calls for 80w90 but I hear that 75w90 is better for MPGS less friction has anyone herd that also? and I dont think that I'l run into any problems.
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Old 02-02-2011, 12:13 PM
ben10 ben10 is offline
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Default Re: back and front diff.oil

i would stick to the little bit heavier stuff for better lubrication properties, i doubt a lighter oil will give you that much better mileage...
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Old 02-02-2011, 02:19 PM
jack7481 jack7481 is offline
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Default Re: back and front diff.oil

I understand what your saying,but not just the diffs will have synthelic oil but all oil will be switch over so if I can get a .5 to 1 diffarance from using it then all good with the price of gas today.
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Old 02-13-2011, 06:42 PM
Twisty Twisty is offline
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Default Re: back and front diff.oil

Use what the book says.
I switched to syn. lube and gained about 2 mpg. Go for it!!!
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Old 02-13-2011, 07:40 PM
oldcarfart oldcarfart is offline
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Default Re: back and front diff.oil

Quote:
Originally Posted by jack7481 View Post
This spring I am going to change the back cover on the diff. with one that has a drain hole,clean out the front diff. and add 100% synthetic valvoline sny power gear lube.As for what weight the book calls for 80w90 but I hear that 75w90 is better for MPGS less friction has anyone herd that also? and I dont think that I'l run into any problems.
Try to find 5W140 (Amsoil?)
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Old 02-14-2011, 07:14 AM
sgtsandman sgtsandman is offline
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Default Re: back and front diff.oil

I would stick with what the owner's manual says, just get the synthetic version in that viscosity.
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Old 02-15-2011, 01:38 PM
jack7481 jack7481 is offline
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Default Re: back and front diff.oil

royal purple makes 75 140 that for the ford diff. gl-5

I dont think 80w90 is made in sythelic.
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Old 02-15-2011, 02:51 PM
Clinton Clinton is offline
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Default Re: back and front diff.oil

Quote:
Originally Posted by sgtsandman View Post
I would stick with what the owner's manual says, just get the synthetic version in that viscosity.
I agree with the SGT!
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