ok cool. so probably the ASL or ATM... man amsoil's website makes it hard to research their products.

i like 20-50 on mine

Amsoil tech sheet says recommended oil weight is 10w30. It's still a "mpg" oil. I just wouldn't run 5w with an FI engine.

Wouldn't the initial viscosity be a moot point since it "thickens" as soon as the engine warms up? I thought the important part was the 30w?

kinda but still a 30 max just doesn't make sense to me way to thin. But maybe i beat on my car harder than most of you guys :dunno:

All the 5w30s I've seen have been thinner out of the bottle than 10w30s.

Is that like when you go down hill you go faster? :rofl:

My wife always make fun of me because I can make a decision on buying a house on the spot, but I agonize over the smallest things. lol

I was thinking about changing from M1 to Penzoil Platinum for next oil change, but the Amsoil is just too good to pass up. Now back to agonizing over 5w vs 10w. :)

yes but you don't make threads about not being able to decide what color your plug wires should be. ;) Unlike some people

I'm running 5w30 now, but my oil pressure at idle is way low. can't hurt to try some 10w30. not sure if the low temp rating is relevant at idle temps.

No.

Personal opinion, but I can't see turbo guys running 5w oil, esp since the oil runs through the turbo. If then engine's FI'd, I'd run at least 10w. Your bearings will thank you.

Ok, after reading though a bunch of stoff on BITOG this is the result:

1. I have a headche.
2. Amsoil is a better oil than Mobil 1
3. Amsoil recommends 10w30
4. Mazda recommends EITHER 5w or 10w
5. Gary @ TDR recommended 5w30 synthetic - specifically Redline (which he sells).
6. I have a headache.


Therefore, I will probably get... ah hell I don't know. :(

Bottom line: I think it's a win/win situation since Amsoil is a better motor oil.

I think the 10w30 is the way to go for a turbo miata especially if you aren't in the arctic circle.

Is amsoil better than redline? I've been kind of concerned with this news about Mobil1's new formula. I'll be switching to either amsoil or redline soon, but I only want the highest quality oil since I race and autocross.

Back home, we have to run 5w30 synthetic. Dino oils turn into mollasses in -50F weather and i've seen it -86F. They're so thick that your oil pump can't flow oil through the motor, many people have lost engines due to this.

I've watched the Ice Road tv series about Yellowknife. It's pretty wild.

but they never show miatas driving up there. the convertible top would shatter i bet.

but here it doesn't get down to less than like 10° ever.

There are a few miata's up there but not many. The only way I would have one up there would be with a hardtop.
Before I knew anything about miata's my roommate told me to take his car to the store and to put the top down. I went outside and unlatched the top, pushed it back a little and heard a loud crack. The rear vinyl in his '91 shattered, it was around 30*. He didn't mention that i needed to unzip that bitch. Not that I should have been putting the top down when it's that cold anyway. Just didn't think about it, needless to say i bought a $165 no zip top off ebay from that popular seller and we installed it.

I received my test kit so I'm going to mail that in today and see how mine looked after about 3000 miles. Actually it wasn't even black yet.