81 replies to this topic

[lonelywanderer]

idk if the previous owner was running synthetic or not but i've been running amsoil 10w30 and havent had any problems with oil consumption or smoking on my 2j to my surprise as the oil looked pretty thin. gonna try go with a heavier weight and one of those larger wix filters soon

[Jacob]

wow. skip from page 1 to page 3... it's like a person will make a post with 90% truth and 10% opinion. And all the rest of you ignore it and continue in this pointless banter about how your slightly different approach has always done you right or some half scheme to get an imaginary advantage.

I use charmin toilet paper in layers as an airfilter ...runs like a champ. For better gas mileage, I'm runnin straight 27"s yo. As a fuel additive, one handle of Everclear to every tank of E85 ...and a scotch bonnet pepper. And oil, I don't even run that shit. You all are cattle. The government is just trying to keep us dependent on oil and justify their wars. Like lambs to the slaughter, all of YOU!!!! THE END IS NIGH! I TELL YOU A TRUTH!! THE END IS NIGH!!!!

[Kyle]

Moo, nigga, moo.

Now running 10-30 castrol full syn

[rayray]

was going to post up some specs for different oils up but since it only applied to the oil weights i use, and for the sake of jacob's sanity of staying on topic of the OP's question, i'll leave it out.

but if you're switching to synthetic, and your seals are already tired and worn, might as well replace them and make the switch. synthetic all the way bro!

[Kyle]

Synthetic affects the integrity of old seals?

There's nothing you can do about Jacobs sanity, it's a whimsical creature that comes and goes. I call hes the next Gordon. In fact, move on down here Jacob, you can crash til you find a place, or just run off my gf and stay

[rayray]

switching to synthetic seems to be a general concern for tired motors, and people post various reasons as to why. i'm no conventional to synthetic oil expert so i personally have nothing to say

but here's a quick answer from mobil 1

[rayray]

i've heard "molecules are smaller = more leaks/seepage" "deposits prematurely wearing out/ruining seals" and others

this is the most common myth i come across or hear

[ChriSOL]

fuck i hate that there is so much misinformation floating around out there and 99% of it is anecdotal. I was told by a lot of people, including long-time mechanics, that my phantom oil pressure issues were due to switching to Mobile 1 10w30 from the Brad Penn oil that was in there before for maybe 1,000 miles. I switched to 15w40 conventional oil, then had to go to 10w40 when i couldn't find the 15w shit.

my mechanical oil pressure gauge showed high 40psi during warmup and around 25-30 after the engine was fully warmed and driven normally for about 30 miles. Sometimes I hear people talking about how pressure up to 125psi is normal under cold start, and 40 is normal for warmed up and driven conditions... fuck my head hurts from all this bullshit.

[brian]

From what I've read pretty much all oils come from the same base stock. The GL rating determines their additives, so it really doesn't matter what brand you pick.

So on that note I want to try some of the specialty blends of oil with high zinc ratings though. I think JZs prefer a high zinc ratio and most oils starting after 1999 are in the mid 800s ppm. Oils used to have 1200+.

[jackc]

I've always ran 10w30 syn Mobil 1 on my 1J and I beat the shit out of it.

Recently switched to 15w50 Mobil 1. Car seems to like it

[ChriSOL]

i refuse to believe in a lot of the hype about oil brands etc... and i spent my time reading the resources about additives and bullshit. that being said i have had some stupid oil related issues when switching between "weights" and types, so it seems like i need to be more thorough.

 

i buy my oil at wal mart because you can get a 5qt jug of any full synthetic for $25. always used Mobil1. being wal mart, they were out of stock of the normal 10w30 for like 3 months so i bought a jug of the 10w30 for high mileage. i figured why not? probably same shit, just marketing gimmick. it was the same price. i changed my oil and within a week my miata had the notorious lifter tick on cooler mornings. it's been like 20k miles of oil changes with the regular stuff and i had never heard a single tick before then. changed it again last week with the regular 10w30 and there's no sign of tick anymore.

 

i used the 10w40 high mileage Mobil conventional in my 1jz because on full syn or any oil without the "high mileage" sticker, the twins smoke on idle down. I'm about to switch back to synthetic when i start driving it again soon, and i fully expect more smoking to occur as a result.

[ChriSOL]

read that whole thing in detail twice.

 

going 5w30 in the miata = lifter tick.

 

going without whatever high-mileage additives Mobil puts in their oil causes the twins to smoke on the 1j, which wont really be a problem too much longer.

 

the gist is, educate yourself and make a decision, determine if it's right for you based on the results you get and adjust accordingly.