Oil weight in 1993 Mustang GT? - Ford Mustang Forum

 
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post #1 of 11 (permalink) Old 11-11-2008 Thread Starter
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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....


DD 2003 Excursion turbo diesel, 04 Trailblazer,other toy 06 300 SRT8 98 GMC burb.
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold 85 GT sold 87 GT vert sold.


NOW 92 GT wild strawberry, BBK headers,off road H-pipe,flowmaster cat back,AOD shift kit,3.55s more to COME.
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post #2 of 11 (permalink) Old 11-11-2008
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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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post #3 of 11 (permalink) Old 11-11-2008 Thread Starter
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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

DD 2003 Excursion turbo diesel, 04 Trailblazer,other toy 06 300 SRT8 98 GMC burb.
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold 85 GT sold 87 GT vert sold.


NOW 92 GT wild strawberry, BBK headers,off road H-pipe,flowmaster cat back,AOD shift kit,3.55s more to COME.
MY 85 GT is offline  
post #4 of 11 (permalink) Old 11-11-2008
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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.

MAC offroad H, pullies, Flows, Explorer Intake, Mac Shorties, BBK fenderwell CAI, GT40 Heads, Full length Subframe
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post #5 of 11 (permalink) Old 11-11-2008
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I would never mix weights. I use 10W30 Castrol with Lucas
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post #6 of 11 (permalink) Old 11-11-2008 Thread Starter
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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

DD 2003 Excursion turbo diesel, 04 Trailblazer,other toy 06 300 SRT8 98 GMC burb.
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold 85 GT sold 87 GT vert sold.


NOW 92 GT wild strawberry, BBK headers,off road H-pipe,flowmaster cat back,AOD shift kit,3.55s more to COME.
MY 85 GT is offline  
post #7 of 11 (permalink) Old 11-11-2008
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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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post #8 of 11 (permalink) Old 11-11-2008 Thread Starter
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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?

DD 2003 Excursion turbo diesel, 04 Trailblazer,other toy 06 300 SRT8 98 GMC burb.
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold 85 GT sold 87 GT vert sold.


NOW 92 GT wild strawberry, BBK headers,off road H-pipe,flowmaster cat back,AOD shift kit,3.55s more to COME.
MY 85 GT is offline  
post #9 of 11 (permalink) Old 11-12-2008
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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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Stick with 10W-30, you will be fine.
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10/40w oil valvoline synthetic max life high mileage

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