HX_Guy

Its been around 2500 miles...time for Mobil 1?

b00st-0wnz

never. castrol gt-x all the way.

AssPenny

Don't listen to dave, he'd put beer in his car if he could. I ran gtx till 9,000 and then switch. However, I did spin a rod bearing at 10,500 so who knows.

sgT

Of course, I change my oil every 2k miles. But any performance minded
person should change at about that frequency

1QWKGS

CASTROL GT-X

HX_Guy

really? is the gt-x better then say valvoline?

hell i change my oil like every 1000 miles

sgT

GTX is just what I've always used and its never done me wrong.
I may have first bought it because it was the cheapest, but it works.

b00st-0wnz

I have ~42k on my car. HARD miles, lots and lots and lots of road course hours, etc. Barely burns a bit, car puts down 169/122 (b18c1 with intake, header, ghetto exhaust and vafc, nothing else), etc. I love GTX. It's never done me wrong and I never plan on using synth oil again (except in my conquest.. but I may even switch that..)

HX_Guy

Thats pretty surprising...

I would have figured alot of people used synthetic
Hell, regular oil is so cheap...might as well use that and just cahnge it more often.

sgT

i change my oil every two weeks.
could you imagine how expensive that would be with mobil1??
oh wait, you can lol

b00st-0wnz

a LOT of people do. I just don't know why.

nsxtcjr

Mobil 1. Better flow characteristics when cold. Better protection against thermal breakdown when hot.

b00st-0wnz

And the proof is... where?

Mike M

Castrol GTX
A few years ago I went with Mobil 1 and the car started burning oil at a higher rate, 4-5 months passed I changed back to Castrol and the oil burning decreased to normal levels.
PS I change my Oil about every 2500 miles or so

py1188

Isn't there a problem with switching back to conventional motor oils after using synthetic?? I've heard this before but I'm not sure if its true

Cold Chunker

Well....put a quart of each in the freezer for a good while, then pour. Then put equal amts into test tubes and put a burner flame underneath. Figure what you want in your engine from that.

Want more #'s? http://pacific.telebyte.com/allanw/b...fo/oilfaq.html

A sample from the above link:

Brand VI Flash Pour %ash %zinc
10W-30
Castrol GTX 140 415 -33 .85 .12
Mobil 1 160 450 -65 --- ---

All indicators point to M1....IMO. You may see it differently.

The Toecutter

Every year my students (I'm a teacher) have to do a researched-based science paper where they have to design an experiment, test it and base conclusions from it. Last year a student of mine tested the flow characteristics and thermal breakdown of several motor oils, including mobil 1. I can't recall exact numbers but somewhere north of 280 degrees F all of the organics caught fire and turned into sludge. The only oil that did not was Mobil 1 and it caught fire north of 400 F. He put the fire out and poured it into a can where it retained some viscosity.
Additionally, I have about 70k on a motor that I too beat up regularly and it does't burn a drop of Mobil 1. Sure it's more expensive but I figure a little more protection can't hurt.
just my .02

SEFIxCivic

Well, i don't know if this helps anyone, but if your motor has an "incident", running mobil one @ $5 quart isn't going to save you. I used mobil one since day one once my motor was broken in and it still spun a rod bearing. as much as i care about my car, i must admit that i did avoid changing my oil at 3000 miles sometimes because mobil one is so expensive. from now on im going to use conventional oil and change it @ 2000 miles.

B2FiNiTY

iTrader: (2)

If your going to change it so often, then just use normal oil.

HX_Guy

I wouldnt blame spinning a bearing on synthetic or non-synthetic motor oil

SEFIxCivic

I definately don't blame the oil. what I'm saying is that when something catastrophic happens, running synthetic isn't going to help you.

b00st-0wnz

PLEASE. The WORSE oil in that test flashed at a HIGHER temp than I've ever seen a car's oil temp go to. Good mathematics, but every oil listed there would never flash in a motor unless you were DoEs AnYoNe KnOw WheRe I CaN GeT SoMe StRObE LiTEZ AnD LiGhT uP WiNdShiElD NoZzLeS??ed anyways.

b00st-0wnz

AP isn't blaming the oil. He was just making a comment, he never said "Mobil 1 fugged up my motor"

b00st-0wnz

Your students test results don't quite mesh with those in the above test for flashing.. I've seen a ITA CRX hit 290-300 oil temp before with mineral oil (castrol gt-x at that) and it had absolutely no problems in a 30 minute SAARC race.

ITRinEJ1

i usually use mobil 1 and have used castrol semi-synthetic when i am cheap and i have never had any burning oil problems.....i'm surprised some here dont use synthetic, maybe i should try out this castrol gtx too that's what i use on my beater