should I use regular dino fluid 80w90 valvoline or synthetic 75w90 mobil 1 for stock 85 mustang gt, I think this rear end is ford 7.5
quick fluid question 80w90 or 75w90 for 85 mustang gt stock 5.0
should I use regular dino fluid 80w90 valvoline or synthetic 75w90 mobil 1 for stock 85 mustang gt, I think this rear end is ford 7.5
Always Stay Humble. -Sinister-
I changed the fluid in my 5.0 92 2 months ago,been aprox 600 miles since, I used the semi synthetic from walmart, I believe it was 75/90, I didn't add any friction modifier either, on the bottle it said use for topping off limited slip axles, I figured it would work, judging by the dual black marks and no noise, I'd say its all good.
Last edited by FM2NOTCH; 11-19-2013 at 12:57 PM.
*FOXTOBERFEST* 2015 http://www.foxmustangrestoration.com/events
85 T Top coupe 5.0 2R red, E7's, rpm intake, 4180 carb, 7.4 1/8
83 CC capri 5.0 5 speed,black mesh wheels
76 cobra II 302 auto black/gold, big cam 3 inch dumps- sold to a good friend
92 coupe 5.0 5 speed -red
92 Lx hatch 5.0 5 speed -black, 66 coupe 5.0 4 spd (project)
87 Vert 5.0 AOD red stock as a rock
" Are you sure you know what you're talking about? It kinda sounds like you know what you're talking about"
I would use the regular oil. You have gotten 135K out of the rear with it- it must work. Plus, you will probably be into some sort of repair soon on a 7.5 with 135K, so why drain out expensive synthetic and toss it in a couple of years?
1983 Mustang G.T. No-option stripper- I like strippers.
5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.
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