Running 0W-40 where 5W-30 is specified

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Doesn't 0w-40 have better flow at any lower temp. than 5w-30??

That + the extra zinc/phos would make the 0w-40 better in my book
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Originally Posted By: ukmastermind
Doesn't 0w-40 have better flow at any lower temp. than 5w-30??

That + the extra zinc/phos would make the 0w-40 better in my book
smile.gif



No not necessarily. Depending on the product the 5w30 synthetic should be lighter until a certain point.
 
Would 0w40, or a 5w40 be better for a car that specifies 5w30 (98 corolla) in humid 97-102 degree heat, be better? Last year i ran 10w30 peak synthetic, it was good, but the engine had a watery consistency, i can sense it the oil. would a 0w40 or 5 or even 10w40 be better at those temps?
What i found out, was a 10w30 dino ate up a bit more fuel on me.2 miles a gllon a member here stated to me. the 10w30 synthetic didnt really eat up as much. so becuase its 40 weight, be it 0,5,10..ide imiagine fuel would go up quite abit on me.
 
Penrite recommend the HPR 5 5w-40 as a 5w-30 replacement.
Am I correct in saying that at HTHSV of 3.9 it is too thick, across all temps, as a direct 5w-30 replacement?
Excuse my ignorance if this has been spelled out.
 
I ran Valvoline ML SB 5W-30 for 30k miles in my vehicle which has a GM aluminum 5.3L V8 with no AFM. It consumed the Maxlife at a rate of about 1 quart per 1,500 miles or so. I have no blue smoke and no apparent leaks or drops. Coolant does not show signs of contamination.

At ~85k miles, Nov2013, I switched to M1 0W-40. I've read that thicker oils may help curb oil consumption. This vehicle is also a short tripper, so I'm concerned about fuel dilution.

Oil consumption has not changed (yet). Fuel economy has not changed in any meaningful way or at least not in any way I can attribute to the oil. A 5,000 pound SUV with a V8 is a gas pig.

I have not noticed any changes in cold cranking, even at -6*F.

After looking at various posts on this site, in the PCMO section and UOA section, I have yet to see any proof that M1 0W-40 (or any other PCMO 0W-40 or 5W-40) caused problems for an engine. If these engines are operating in bypass for a significant amount of time while running xW-40, it does not seem to be hurting them in any appreciable way.

Dumping M1 0W-40 into my engine did not result in anything amazing or magical. From the driver's seat, it appears to be performing as well as the ML SB 5W-30 I had in there prior. I have enough left for at least 1 more oil change with it. After that I plan on trying QSUD 5W-30 or ML SB 10W-40. Why? I have them on the shelf.
 
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