View Poll Results: M1, RP, or GC (FULL SYNTHETIC)
Mobil 1 5w30
249
40.82%
Royal Purple 5w30
195
31.97%
German Castrol 0w40
166
27.21%
Voters: 610. You may not vote on this poll
Mobil 1 Royal Purple or GC
04-21-2006, 10:07 AM
#1
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Nov 2005
Posts: 419
Likes: 0
Received 0 Likes
on
0 Posts
Mobil 1 Royal Purple or GC I have a 98 ws6 with 40k miles and minor bolt ons I have oil consumption problem,s and I have read and noticed my 5w30 M1 is thinnning quickly, I want to know if the 0w40 GC is what would be better to run or a Royal Purple product, anyone with their two cents would be greatly appreciated.
04-21-2006, 11:46 AM
#2
TECH Fanatic
iTrader: (2)
Join Date: Jul 2004
Location: Greensburg,PA
Posts: 1,882
Likes: 0
Received 0 Likes
on
0 Posts
have you considered a catch can, upgrade your pcv valve, the oil your using is fine, I run it my self, others use the german castrol but is sometimes is hard to find. Is far as the purple, some swear by it, personally I would never run it, seems like a gimic to me, but I have never tried it so I really can not be a valid opinion as to its performance. But most that run it use the race blend 40, which I am told is the equivelent of a 5w-40.
04-21-2006, 02:41 PM
#3
12 Second Club
Join Date: Sep 2005
Location: Bucks County, Pa.
Posts: 4,273
Likes: 0
Received 0 Likes
on
0 Posts
The German Castrol is actually a 0W-30 that is much thicker at operating temps than Mobil 1 5w-30, and will not thin out/shear down as badly as the M1. The problem (as stated above) is finding it. I've never actually seen any despite actively looking for it everywhere I go.
The Royal Purple RP41 is actually like a 10W-40 and is a very good oil which many have used with great results. I just wonder whether or not it has enough detergents in it to use long term on the street. Since it is labeled a "race oil" which typically have no detergents added to avoid foaming at ultra high revs.
The Royal Purple RP41 is actually like a 10W-40 and is a very good oil which many have used with great results. I just wonder whether or not it has enough detergents in it to use long term on the street. Since it is labeled a "race oil" which typically have no detergents added to avoid foaming at ultra high revs.
04-21-2006, 05:39 PM
#6
TECH Enthusiast
Join Date: Aug 2002
Location: Los Angeles
Posts: 521
Likes: 0
Received 0 Likes
on
0 Posts
Mobil 1 5w-30 This oil is tooo thin!
Royal Purple 5w-30 This oil shears too easily;
GC 0w-30 This oil is built just right for the LS engine.
PS. GC is 0w-30 and not 0w-40.
Royal Purple 5w-30 This oil shears too easily;
GC 0w-30 This oil is built just right for the LS engine.
PS. GC is 0w-30 and not 0w-40.
Trending Topics
04-23-2006, 03:50 AM
#11
TECH Enthusiast
iTrader: (1)
Join Date: Mar 2005
Location: CA, Bay Area
Posts: 625
Likes: 0
Received 0 Likes
on
0 Posts
AMSOIL 10-40 got rid of all my oil comsumption. i didn't have any oil issues before the cam but once it was in it started eating up M1 10-40. Amsoil solved that and quieted down my valvetrain. AMSOIL 
04-23-2006, 04:15 AM
#12
Launching!
Join Date: Dec 2003
Location: Palm Bay, Florida
Posts: 260
Likes: 0
Received 0 Likes
on
0 Posts
85K miles on Mobil1. Tried German Castrol but didn't see any benefit. Oil consumption was still very little. Went back.
Dont forget a catch can. They used to be cheaper though.
Dont forget a catch can. They used to be cheaper though.
05-14-2006, 05:05 PM
#17
Staging Lane
Join Date: Feb 2004
Location: In the shadows
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
M1,RP, either way 5w 30 is just fine, I heave seen many of cars making alot more power than street cars use it and have no sheering issues. If your having sheering issues you may need to do more than thicken your oil, thinner oil = faster moving parts less weight on internals. And 5w 30 is perfect for the LT1,LT4,LS1,LS6,LS2,LS7 !!!
05-15-2006, 12:01 PM
#20
TECH Resident
Join Date: Apr 2005
Location: NJ
Posts: 814
Likes: 0
Received 0 Likes
on
0 Posts
when i got my car i put m1 5w30 in it and it was noisey and seemed like it wasnt enough for the motor and i was consuming tons of oil like a quart every 1k mi, i then swtiched RP 10w30 and it got better not as noisey and less oil consumtion,but lately i swtiched to the GC 0w30 and im sticking with it. tests have shown its the best to use and ive gone down to about only 1qt every 3k mi. the enigne runs quiet and im happy sense its cheaper than RP,i also picked up 2mpg with it , we also had the exact issue in my gf monte carlo ss. m1 5w30 noisey in the motor and a drop in mileage. GC 0w30 problem solved and much smoother running afterwards no lie. GC is the best and im sticking to it, m1 sucks its to thin, the 5w40 is suposed to be ok but im not useing it.