friction additive
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friction additive
just serviced both the front and rear dif on my o2 f350. does either one, the front or rear need friction additive. in the rear i am going to run lucas synthetic 75w-140 and it says no additives need on the bottle. in the front i will be running 75w-90 amalie synthetic. whats the verdict on friction modifier additive?
Post Fiend
Joined: Mar 2007
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From: Texas
A friction modifier is needed on limited slip diffs. Some lubricants already have a friction modifier built in so there's no need to add any.
I don't know about the lucas, but if you hear chatter in the turns you need to add a modifier. If not then leave it alone.
I don't know about the lucas, but if you hear chatter in the turns you need to add a modifier. If not then leave it alone.
Post Fiend
Joined: Mar 2007
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From: Texas
The spec calls for 8 oz., but it's best to add 4 oz if needed and bump it up as needed to get rid of the chatter. The LS works better without too much modifier in there.
Post Fiend
Joined: Mar 2007
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From: Texas
Royal purple was the one I was thinking of that does not need the additive. Lots of folks here swear by the stuff.
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Joined: Feb 2007
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Mobile 1 Synthetic
I had mine changed with Mobile 1 Synthetic which contains the friction modifier, per their label. Well, my rear chattered. Added 4oz and it cured 85%. Added another 4oz bottle and the rear seems OK. Every now and then I perceive chatter. Limited slip seems to work fine too.
Neil
Neil
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