I've never been an oil snob and usually just purchased off the shelf synthetic but wanting to give the SHO better blood.i'm getting ready to order some amsoil and wondering what oil weight would be ideal for my climate in CO. obviously in these winter months ill be seeing single digit temps and below on occasion. . however, a couple days later it can be in the 50's or even 60's. what oil would be best suited for these kind of temperature swings? i'm kinda leaning towards 0w-30 in the winter and 5w-30 summer. or maybe 5w-30 year round? what do the lube experts say?


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I would go with 0W30 year-round just for easier startups and a bit better mileage, less strain on the battery, etc.

Other than that, 5W30 year round should be fine.

Shodded is spot on..0-30 is good year round
And flows faster when cold...oil that covers a wider viscosity range is less resistant to shearing but the beauty of amsoil is its basically indestructible so you dont have to worry about shearing so it stays more true to its original viscosity

Quote from: SHOdded on December 26, 2016, 02:11:06 PM
I would go with 0W30 year-round just for easier startups and a bit better mileage, less strain on the battery, etc.

Other than that, 5W30 year round should be fine.

thanks for vote #1. as i understanding 0w30 holds up just the same in high heat as 5w30? so 0w30 is the better all around option


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Yes it should.

Good info! I have 6 more qts of Amsoil 5w30, but after that is used up, I think I'll switch over to 0w30.

I was going to send a 5k sample of 5w30 to Blackstone to see how it's holding up.


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Quote from: MiWiAu on December 26, 2016, 11:14:11 PM
I was going to send a 5k sample of 5w30 to Blackstone to see how it's holding up.

Looking forward to results!  But it should easily hold at that point, maybe a little less so than for port injected engines, but robust nonetheless.

I've used 0w30 in my Subarus and have always got a head gasket around the next or second oil change someone has mentioned this might create more oil pressure my Subarus are over 100k on had just had the head gaskets changed so I thought it would be fine using roral purple 0w30
Maybe it cleaned some stuff out.
But I've chosen to stay with 5w30 till someone else can prove the car will be fine with it.

I've owned two 2.2 imprezas .

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Quote from: Gjkrisa on December 27, 2016, 12:24:20 PM
I've used 0w30 in my Subarus and have always got a head gasket around the next or second oil change someone has mentioned this might create more oil pressure my Subarus are over 100k on had just had the head gaskets changed so I thought it would be fine using roral purple 0w30
Maybe it cleaned some stuff out.
But I've chosen to stay with 5w30 till someone else can prove the car will be fine with it.

I've owned two 2.2 imprezas .

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Not sure what you are talking about at all.....0w-30 or 5w-30 would not cause head gasket failure! period....At operating temp 0w-40 and 10w-40 have the same viscosity

At start up and when cold the 0W oil will flow faster with less resistance than a 5W or 10W.....At cold temps a 5W or 10W may be too thick to flow fast enough to vital engine parts which is why pressure is higher with cold temps, it is resistant to flow

Oil viscosity is determined by temperature....Temperature dictates viscosity

If your car recommends 5w-20 and you beat the crap out the car at a road course chances are you will have too low oil pressure because you've super heated the oil and it gets thinner which lowers oil pressure, to get the pressure back to what the engine needs you need to get a heavier weight oil

0w-30 would yield the same viscosity if driven super hard or in hot areas as 5w-20 if not driven hard for example.

Viscosity changes based on temp....When viscosity ratings are given there is always a standard temp constant

Just like fuel injectors are always displayed in flow at a given pressure....Change the pressure the flow changes....Standard fuel injectors are rated at 43.5 psi And I think oil is like 0c and 100c but I'd have to check

Chances are there was oil blocking the leaks and when I put in good oil it cleaned out the sludge to make them leak.
That is just what has happened to me to I'm not taking any risk I know how the viscosity changes but seeing that a hand built GT-R is only vehicle that I've seen recommend oil is 0w30 I'm not risking it on my 2016 till someone else has used it for awial
Thank you.

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Yes the oil weights are rated at 0c for cold and 100c for hot.

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Quote from: Gjkrisa on December 27, 2016, 01:41:08 PM
Chances are there was oil blocking the leaks and when I put in good oil it cleaned out the sludge to make them leak.
That is just what has happened to me to I'm not taking any risk I know how the viscosity changes but seeing that a hand built GT-R is only vehicle that I've seen recommend oil is 0w30 I'm not risking it on my 2016 till someone else has used it for awial
Thank you.

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I've been using 0 weight oils for years (Mobil One and Amsoil) on a variety of Ford engines.

90% of all wear occurs at startup so the thinner at startup the better.

If there was an issue, these oils would not receive the same Ford certifications as the 5 weights.

The only vehicle I wouldn't run it in is one with high mileage that I couldn't verify the service history.

thanks AJP and FOMO for the posts. that was the kind of info i was looking for. thinking of the most abusive situation i would put the car through -would 0w30 hold up fine hot lapping a few 1/4 mile runs?


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1/4 mile blasts are nothing...I've talked to multiple reps from amsoil and they say road racing is what would require thicker oil

Quote from: 8nutz8 on December 27, 2016, 05:00:49 PM
thanks AJP and FOMO for the posts. that was the kind of info i was looking for. thinking of the most abusive situation i would put the car through -would 0w30 hold up fine hot lapping a few 1/4 mile runs?


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It's a non issue as the oil will be hot and behaving as a 30 weight anyway.