Rear Diff Lubricant
#1
Rear Diff Lubricant
Sorry if this has been asked before, but I searched for an hour and haven't found a similar post.
2002 F150. The manual recommends 75W-140. Is 75W-90 AMSOIL an acceptable replacement? The service center at my local dealership says no, but he has to I assume since Ford specifically mentions 75W-140.
Thanks.
2002 F150. The manual recommends 75W-140. Is 75W-90 AMSOIL an acceptable replacement? The service center at my local dealership says no, but he has to I assume since Ford specifically mentions 75W-140.
Thanks.
#2
Go with the 75-140
Go with the 75-140, it used to be fairly Ford specific and $20 per quart but now it's everywhere. Make sure it's synthetic and add the friction modifier if you have a limited slip. There are other friction modifiers out there as well but I'd stick with Motorcraft at $3-4 a bottle.
#4
What would be some differences between the 2?
AMSOIL says that 75W-90 is recommended for most applications. Both the 75W-90 and 140 offer GL-5 protection. They also say that fuel economy is better on the 75W-90. According to their website it 75W-90 is fine for all but the most demanding conditions. The most demanding that I get is driving on sand or towing a bass boat with a weight under 3500 lbs.
Not trying to intentionally go against the Ford recommendation, but I already have a bunch of the 75W-90 and if it is fine and will not cause harm then I would like to use it up. I am also not opposed to going to the recommended weight if the lighter weight is taking a gamble.
Thanks.
AMSOIL says that 75W-90 is recommended for most applications. Both the 75W-90 and 140 offer GL-5 protection. They also say that fuel economy is better on the 75W-90. According to their website it 75W-90 is fine for all but the most demanding conditions. The most demanding that I get is driving on sand or towing a bass boat with a weight under 3500 lbs.
Not trying to intentionally go against the Ford recommendation, but I already have a bunch of the 75W-90 and if it is fine and will not cause harm then I would like to use it up. I am also not opposed to going to the recommended weight if the lighter weight is taking a gamble.
Thanks.
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#10
Smart man
Originally posted by mstaszew
I opted to be safe and went with the Valvoline 75W-140.
I opted to be safe and went with the Valvoline 75W-140.
SL
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