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Yep - maybe, maybe (probably not) this was different with carb engines, but ... and, then only at maximum flow (full throttle) ... again, maybe ... Great marketing by K&N, though ... Goldman Sachs owns K&N (2016) so ....

I'm not sure anyone could tell any difference between 0W-20 and 0W-30 - at any temperature even if starting really cold with both still 0W ... "a few MPG" difference is just not possible. It's even illogical.

I'm still dubious either of those would CAUSE a single burnt valve ... sooo many other potential causes.

Do you really think air filter changes and fuel with more additives (assuming this is a port injected engine) would matter?

I had one removed yesterday - I had asked AI to do the math on something - I guess even that sort of AI (vs AI from using a calculator) is not allowed.

Good stuff, ItsSlimJim - I gotta ask, though - why Amsoil SS in 0W-30 vs Mobil1 ESP in 0W-30? Isn't there a 2X difference in cost?

This is generally a science and (near) fact-based site ... feelings on oil don't help much.

Without evidence that those two companies' products make a difference? Or, maybe because Dad only used Exxon gas and Valvoline oil?

C'mon, shilling for companies? Really?

True, all things being equal - and real world city driving cannot provide this ... so, any huge change (like 10%) is simply because the real world city driving differences caused it. "I am not in a controlled environment ..." - exactly. A controlled environment test will not change by 10%...

Cool - you are inaccurate, but it’s OK cause it’s your vehicle and your decision.

Again, nah. Simply too many variables in city driving ... you are way outside the 0.5-2% expectation ... even if extremely cold wouldn't expect that much difference.

Mobil 1 ESP 0w30 is $32 online this morning.

This seems very anecdotal, and scientifically unlikely.

Old post, but a "few mpg" would be in the range of 10% or more? Just from a slight increase (somewhere between 20-30? I don't think so. "A bit of lag with the engine?" Again, I don't think so. Placebo effect?

I'm not following ... why would it "struggle" to get oil up to temp?

A friend of mine has a Tundra - about same year, same 5.7. 200,000 when purchased. No history on oil changes. Used for towing quite a bit. Not burning oil to my knowledge - soooo ... 5W-30 Valvoline Restore and Protect or Mobil 1 ESP in 0W-30 or Pennzoil Ultra Platinum 5W-30?

Maybe over emphasis on city cycle in cold weather? May no longer matter since the base oil development has continued apace.

Maybe we're approaching the oil technology era where almost all of them are so good, we're munching on the very corners of a discussion (assuming suitable OIC)? Fortunately the combination of MPG and government involvement has provided a target for the discussion - thin vs thick. :-)

Agree for sure - so, it "could" be correct, or accurate enough? Not trying to argue the point, but was looking for simplicity.