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Unread 11-11-2008   #1 (permalink)
MY 85 GT is offline GT Member

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Default Oil weight in 1993 Mustang GT?

Ok im getting ready to change my oil in my 93 it has 107.xxx on it i have 3 brand new quarts of 15w-40 synthetic oil I think that might be a little heavy? can i mix that oil say with 10w-40 syntheic oil to make it lighter..?? I really want to use it being that it is so exspensive...or should i use all 15w-40 ...thanks....
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Unread 11-11-2008   #2 (permalink)
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I've always been told to never mix weights. You could go with something thinner for this winter and same the other for next summer. IMO
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Unread 11-11-2008   #3 (permalink)
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Quote:
Originally Posted by MSally View Post
I've always been told to never mix weights. You could go with something thinner for this winter and same the other for next summer. IMO
Ok would it hurt to use all 15w-40 then for the winter? or should i go like 10w-40
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1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold

87 GT Vert.On3 turbo making 14 psi...PRO-M maf,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,tunning with Moates QH,AOD,lentech VB.electric OD,3000 stall.3.55's
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Unread 11-11-2008   #4 (permalink)
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I think you would be safe either way. Using a thinner oil in winter really comes into play when you have extreme temps at startup. The oil gets thicker when its real cold making it harder for the pump to circulate on cold start ups.
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Unread 11-11-2008   #5 (permalink)
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I would never mix weights. I use 10W30 Castrol with Lucas
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Unread 11-11-2008   #6 (permalink)
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I like syntheic oil..i have 3 brand new qts of 15w-40 all i need is 2 more quarts and a filter this time around i might go with that weight do you think i will be ok using 15w-40
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1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold

87 GT Vert.On3 turbo making 14 psi...PRO-M maf,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,tunning with Moates QH,AOD,lentech VB.electric OD,3000 stall.3.55's
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Unread 11-11-2008   #7 (permalink)
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I think it will be ok. The only thing that I would worry about is lubrication on startup.
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Unread 11-11-2008   #8 (permalink)
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Ok im going to be using 10w-40 i was thinking of using royal purple anyone use how do you like it?
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DD 98 GMC suburban 04 Trailblazer,other toy 06 300 SRT8
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold

87 GT Vert.On3 turbo making 14 psi...PRO-M maf,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,tunning with Moates QH,AOD,lentech VB.electric OD,3000 stall.3.55's
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Unread 11-11-2008   #9 (permalink)
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Since Jersey gets fairly cold, I agree about using 10W40. There's lots here that swear by Royal Purple, you can't go wrong with it.
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Unread 11-12-2008   #10 (permalink)
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Stick with 10W-30, you will be fine.
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Unread 11-13-2008   #11 (permalink)
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10/40w oil valvoline synthetic max life high mileage
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