|
|
|
|
| Author |
|
|
Registered
Join Date: Oct 2008
Location: Palos Verdes Estates, CA
Posts: 165
|
Switching oil weight Question
I have been running Mobile 1 synthetic 5W-50 weight. Is it ok to switch to Mobile 1 synthetic 10W-30? I live in sunny San Diego CA. I am contemplating the switch because COSTCO sells 10W-30 pretty cheap.
Thanks! |
||
01-20-2009, 09:47 PM
|
|
|
Registered
Join Date: May 2002
Location: Portland, Oregon
Posts: 12,664
|
Quote:
Does your owner's manual include 10W30 as a recomended weight for your climate? Also, if you have an older car, there are other considerations besides weight. The new SM oils commonly available are not not good for older engines. Read this Oil Thread. While I know the thread is very long, it is worth reading to get a sense of the issues you may be facing.
__________________
Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
||
|
01-20-2009, 10:59 PM
|
|
|
Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
|
JMHO, but a 10w-30 anything is too light for your climate in an air-cooled engine.
I'd be using a 15w-40 or 15w-50.
__________________
Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
||
|
01-20-2009, 11:11 PM
|
|
|
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,133
|
It's not SUN-Diego for nuthin'......30 is way too light
__________________
Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
||
|
01-21-2009, 04:00 AM
|
|
|
Registered
|
I'd stick with XW-50 in whatever brand oil you use since it's not limited by the EPA on how much ZDDP it can contain.
__________________
2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
||
|
01-21-2009, 04:22 AM
|
|
|
Registered
Join Date: Oct 2008
Location: Palos Verdes Estates, CA
Posts: 165
|
I have a 1987 3.2ltr 911 145K miles. Thanks!
|
||
|
01-21-2009, 04:58 AM
|
|
|
|
Registered
Join Date: Dec 2005
Posts: 3,384
|
You need the higher weight for ZDDP and viscosity.
|
||
|
01-21-2009, 05:00 AM
|
|
|
Registered
Join Date: May 2002
Location: Portland, Oregon
Posts: 12,664
|
Quote:
After you read the oil thread (above), you will realize that the curent crop of SM oils present a risk to you car. If it was me, I would stick with what you are using or switch to SWEPCO 15W-40 or Brad Penn 20W-50.
__________________
Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
||
|
01-21-2009, 05:24 AM
|
|
|
Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
|
Oil is not the place to be saving money on an air-cooled engine.
__________________
84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
||
|
01-21-2009, 05:35 AM
|
|
|
Registered
|
30 is not a good "number"...
Best, Doyle
__________________
Recording Engineer, Administrator and Entrepeneur Designer of Fine Studios, Tube Amplifier Guru 1989 Porsche 911 Carrera Coupe 25th Anniversary Special Edition Middle Georgia |
||
|
01-21-2009, 04:13 PM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
Early Porsche has the right answer. The 10-30 version of Mobil 1 has insufficient ZDDP in it. The 15-50 version has just enough. Don't know about the 5-50 or any other wt.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
01-21-2009, 09:18 PM
|
|
1979 Porsche 930 3.4
