Rushin

iTrader: (18)

RP or die! Just kidding... but I do use Royal Purple in all my cars. Including my Cavalier!

Anthony Williams

iTrader: (3)

99' Z28 140k mi.
I use to run Mobile 5/30 but switched to Synthetic 15/40 Rotella T at about 60k. Because of my desert runs from LA to LV Mobile 1's thinning concerned me, I deal with alot of truckers and they swear by Rotella T and Rotella quieted my valve train. I figure I can give up a few HP in my daily driver for what I feel is better protection. Used the Royal purple only in my diff.(Gleasen) and it howled like crazy Mobile or Amsoil work best for me.
Best advice though, change what ever oil you run every 5k max.1981 Toyota traded @ 181k, 1991 5.0 GT traded @ 120k , 1989 Nissan traded @ 210k, 1998 Nissan traded @ 170k.

1slowcar

iTrader: (5)

Mobil Syn in everything I've owned (LS stuff) It's also been in all my dads race cars. We have never had any problems or magnetic sludge.

Summerwolf

iTrader: (3)

I run whatever synthetic is on sale at the time

valvoline, mobil 1, castrol, or royal purple....my engine looks fricking brand new. Not an issue, I will never use pennzoil though

Schantin

iTrader: (6)

I've run Mobile-1 in all my cars for the past 4 years w/ no probs. In the Camaro I run 10W-30. Had the car apart to the shortblock a month ago. 35K miles....looked brand new, save the carbon buildup on my pistons

BTW, Mobile1 5W-30 seems to give more valvetrain noise in my car, thus my use of 10W-30.

TurbopigB4C

iTrader: (5)

When I was a tech at hummer I saw a 6.0 come in and the customer always changed his oil with royal purple and at 55k the cam lobes had already worn flat. I think there is a reason why GM engineers recommend mobil 1 on all the newer high performance engines.

SIC LSX

iTrader: (10)

M-1 all the way! My car has 114,000 mile and not one problem and it has has 413whp and shift 6800rpm's for hard 30k miles now and still strong and quiet. The inside of my motor looks brand new too. I ran M-1 0w-40 when i was in hawaii and now i run 5w-30. M-1 is in the top 2 oils out anf RP isnt

muayyadf1

May be you don't run the engine for enough time to get the oil to the operational temp. I mean mostly.

Fifedogg

iTrader: (15)

I love these oil debates. Both me and my dad have used M1 in all of our cars and have never once had any engine problems. We have an EVO, WRX, Cobra, and a few vettes. I have been very happy with M1. When I had to take apart my last motor (27k) due to hydrolock. The insides looked brand spankin new. Granted the motor wasn't high milleage but it is a 2000 so there has been plenty time for stuff to sludge. I will be using M1 till I die

dz999

iTrader: (3)

I too have run Mobile one for many thousands of miles and have never had a problem. The engines I've torn down all looked good, no abnormal wear and no sludge at all. Only thing that bothers me that its so expensive and keeps going up.

ZL1Killa

iTrader: (17)

used mobil 1 5w-30 and tufoil for over 20 years here and on 8 different cars from daily drivers to my current trans am. no problems, oil changed every 4k miles

95_transam_lt1

iTrader: (6)

or it is just stuck to the bottom of the pan. correct me if im wrong but arent the pistons and block aluminum? and if you have meal shavings coming from the bearings on the crank you have a bigger prob than oil

TopFlite

The Mobil 1 5w-30 is the worst oil they make. Never use that. It's very thin mass produced oil like you stated and is extremely inferior to their 10w-30/40 weight blend's. Don't think for a second that the M1 10w-30 has even slightly the same protection abilities as the 5w-30, because it does not.
Try Mobil 1's 10w-30/40 series blend's. It's good protection for the LS1 with a K& N oil filter. I say this because when I purchased the Z28 from the first owner, it contained dino oil. I threw in M1 10w-30 accompanied by a K& N oil filter and gained 2-3lbs of oil pressure in neutral as well as in drive. No lie.
If it gave me oil pressure and makes the engine to this day run smooth with no valvetrain noise and no oil consumption, it's got to be good! There will be no
sludge.

Summerwolf

iTrader: (3)

you would have a large problem if a ton of **** was sticking to the magnet, lol.

whitew01ws6

iTrader: (12)

i ran M1 for over 100k and then switched to penzoil platinum full synthetic 1030. i noticed that more "sludge" came out. and i had no more shavings on the magnet i love it!!! penzoil that is.....

Mr. Luos

iTrader: (9)

Mobil 1 is a decent oil.
Overpriced now though...since they are now a basestock III oil.

Royal Purple...is bad.
Anyone that actually uses it ever sent it off for a used oil analysis? The wear metals show higher than most ANY other oil.
Never personally sent any off, but having seen the UOA's, I will stick to either Pennzoil Platinum or Amsoil.



But as mentioned...regular changes, and you have little to be concerned with.

whitew01ws6

iTrader: (12)

YAy PENZOIL FOR THE WIN!!!!!

Killer_Z

iTrader: (1)

mobile 1 since i've owned my camaro, no probs, used mobile 1 on my cavalier wheni had it no probs. mobile 1 on my cobalt ss and no probs.

J-Rod

I use Mobil 1 5w-40 truck and diesel formula. Its better than 5w30 which is basically a 20W oil as soon as you run it.

I've run M1 in all my cars. My truck had 320K miles on it before I got rid of it.