Synthetics in a 91 f250 ?

Joined
Jun 24, 2009
Messages
3
Location
IL
Just got handed down a 1991 F-250 4x4 with a 351W auto standard cab lb and i was wondering if i could run sythetic oil and tranny fluiid in it. didnt know if it would hurt anything being its 18yrs old. Any help would be greatly appreciated. Gotta luv free stuff.
 
Joined
Jan 3, 2009
Messages
14,875
Location
Illinois
Yes you can as long as there are no presant leaks. Synthetic will keep the tranny a few dgrees cooler.
 

OVERKILL

$100 Site Donor 2021
Joined
Apr 28, 2008
Messages
47,088
Location
Ontario, Canada
 Originally Posted By: Steve S
What do you expect to gain by running a syn oil?
Probably just peace of mind.
 
Joined
Dec 5, 2003
Messages
6,990
Location
Everett, Washington
I use and think Amsoil is the best for me....I have no desire to use Royal Purple. Have never tried it though. What do I expect to gain by running syn lubes? Cooler running, longer drive train life, very extended drain intervals, sliding under my as well as family vehicles way less often.........I ain't getting any younger, I will be 48 this year.
 
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