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Discussion Starter #1
I've done searches and really haven't found an answer I use 5w20 synthetic but have noticed 0w20 synthetic in stores more and less availability of 5w20. I store Bullitt in winter so I don't need the 0w20 for that just want to make sure it's safe.ihave mild moss UDP, HRcams and long tubes. Just need someone's knowledge/experience and confirm 0w20 syn is safe if 5w20 cannot be found
 

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Never ran 0-20. But I do hold the theory that even the wrong lube is better than no lube. But then I've had no problem finding 5-20 Mobil 1.
 

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it shouldn't be a problem if the motor isn't built to the extreme and revved to the moon.
i run 05w 30 in my TVS supercharged bullitt and it still has variable cam timing with hot rod cams.
 

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Discussion Starter #4
Thanks guys. I usually use 5w20 pennzoil platinum synthetic. I do like to take the rpms high since I'm sticking with 20weight guess the 0 or 5 won't make a difference.
 

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If I was to use something other than 5W20, I'd probably look at 5W30. It'll do a better job at protecting at higher temperatures and loads. Any of these weights will probably be fine, especially when using synthetic. The newer 5.0's actually call for switching from 5W20 to 5W30 if you see track time.

I've always used 5W20 synthetic in my '08, but I recently bought 5W30 to use next year. The recommendation Ford is making for the new 5.0 actually influenced my decision to do that. I'm planning on numerous track days in typically hot weather, so the extra protection should be a good thing.

If I was running in strictly cold weather I'd entertain the idea of running 0W20, but I don't think I'd switch to it otherwise. Honestly, there a high likelihood you won't notice any difference no matter which weight you use.
 

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Engine oil is a big subject. Viscosity is the resistence to pouring. The ratings are based on water which has a viscosity of 1.00. Motor oil viscosity is typically measured at 100 C or 212 F. Most engines keep an oil temperature of around 220-230 F. At 250 F oil starts to breakdown and at 275 F you are in big trouble.
The second issue is, what's the outside temperature? At -40 F, 5W30 pours like Molasses, while 0W20 pours quite nicely and is ready to go to work. 5W20 is rated down to -35 F. The 20 number is harder to quantify. With modern engines, if your ambient temperature is up to ~100 F you should be OK. If you live in southern Arizona, then 5W30 would be a wise summer choice.
So, to summarize 0W20 if it gets really cold say -20 F regularly, 5W20 for all temperate climates and 5W30 for the hot spots. These ratings would refer to semi or full synthetic motor oils. For competition purposes the higher viscosity oil is appropriate.
 

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I notice that the OP is from Ontario Canada.

By all means go with the 0w20 in the winter months but would consider using 5w20 during the summer months. I think that combination will give you the "best of both worlds". IF you lived south of the border, then the question (as pointed out by others) would be 5w20 vs 5w30.
 
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