We run full synthetic in all the Mustangs at this house. 5w-30 in the winter ( and it does get cold here) and 10w-30 in the summer. I run Mobile 1 in me and Maw's vehicles and the boys both run Syntec in thier cars. I know, I probably just started a small war about synthetic vs. petroleum but this is what we use and it works to keep peace of mind.
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1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet.
Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.
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