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I swore I'd never bring the subject of oil up again, but I can't resist. I just have a simple question. Right now, my '08 Bullitt has a crankcase full of 5W30 in it. The question is: Will this hurt the car? I don't drive like a maniac (too much :lol: ) and the last thing I want is engine damage... should I change it to 5W20 or not? And Junior, keep quiet!
 

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Discussion Starter · #3 ·
glennster5.0 said:
Probably won't hurt but ford builds them so I'd follow their recommendations.My .02
Thanks, Glenn.
 

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Only thing I can add is that the under hood sticker on the early Shelby GT said to use 5w30 instead of 5w20.I guess it won't hurt,Unless you drive like I do I wouldn't make it a habit.
 

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08 Shifter said:
Only thing I can add is that the under hood sticker on the early Shelby GT said to use 5w30 instead of 5w20.I guess it won't hurt,Unless you drive like I do I wouldn't make it a habit.
But they later changed it back to 5W20 didn't they?

Must be a reason.
 

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Okay folks, listen up here. In 2001 ford switched from 5/30 to 5/20 wt oil.
The only reason was to try for better fuel economy and emissions. when 1543 got up to 2500 miles on her i changed the oil and went to 5/30 mobil one. It did not hurt or effect the engine in any way.
Unless ford has done really serious changes to the motor other than going to 3valve heads, the 5/30 will not hurt. But if you feel more comfortible with the 5/20 use it. I dont and wont.
 

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There have been countless debates and such about this on www.allfordmustangs.com. Basically, the timing setup on the s197 v6 and v8 engines is pretty oil weight specific. Some people had major timing problems with oils like Mobil1, Royal purple (I think that was the name) and so on and so forth. Some people didn't... Every engine is a little different, I'm sure. And yes, for all you guys that are going to call bs... these runs were several dyno runs with differing oils from different owners across the states. They had problems, they switched oils, it cleared up. Timing is effected by viscosity and specific brands of oils.

But, what most owners and such have agreed on is that you should stick to the oem recommendations for awhile until you put some good mileage on it, then experiment a little. I only use motorcraft 5w20 and motorcraft filters when I do changes. If I ever do change brands, I will listen really closely for a bit to make sure everything is okay and then I'll keep using it.
 
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