Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive

Forums Calendar Active Threads Search Forum Help
Previous Thread
Next Thread
Print Thread
synthetic versus conventional weight? #1253117
06/18/12 02:05 PM 06/18/12 02:05 PM
Joined: Nov 2004
Posts: 951
Alliance, Ohio
V
Valiant_Showoff Offline OP
super stock
Valiant_Showoff  Offline OP
super stock
V

Joined: Nov 2004
Posts: 951
Alliance, Ohio
I have always run Valvoline conventional 10W-40 (with zinc additive) in my street/strip small block, but switched to 10W-40 Valvoline synthetic for the first time and wondering my oil pressures are thru the roof.

Conventional was always at 40 lbs at idle and 60-70 lbs at speed. Now with the synthetic I'm at 60 lbs at idle and 70+ when cruising. Is this normal for synthetic oil?

Should I be running a thinner synthetic than what I'm used to? If so, what weight?
Re: synthetic versus conventional weight? [Re: Valiant_Showoff] #1253118
06/18/12 02:11 PM 06/18/12 02:11 PM
Joined: Aug 2003
Posts: 43,240
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,240
Bend,OR USA
Quote:

I have always run Valvoline conventional 10W-40 (with zinc additive) in my street/strip small block, but switched to 10W-40 Valvoline synthetic for the first time and wondering my oil pressures are thru the roof.

Conventional was always at 40 lbs at idle and 60-70 lbs at speed. Now with the synthetic I'm at 60 lbs at idle and 70+ when cruising. Is this normal for synthetic oil?

Should I be running a thinner synthetic than what I'm used to? If so, what weight?

this is the first time I've heard of synthetic oil having more pressure than conventional oil

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: synthetic versus conventional weight? [Re: Cab_Burge] #1253119
06/18/12 02:19 PM 06/18/12 02:19 PM
Joined: Oct 2004
Posts: 8,165
Left Coast
B
BobR Offline
master
BobR  Offline
master
B

Joined: Oct 2004
Posts: 8,165
Left Coast
Quote:

Quote:

I have always run Valvoline conventional 10W-40 (with zinc additive) in my street/strip small block, but switched to 10W-40 Valvoline synthetic for the first time and wondering my oil pressures are thru the roof.

Conventional was always at 40 lbs at idle and 60-70 lbs at speed. Now with the synthetic I'm at 60 lbs at idle and 70+ when cruising. Is this normal for synthetic oil?

Should I be running a thinner synthetic than what I'm used to? If so, what weight?

this is the first time I've heard of synthetic oil having more pressure than conventional oil



Usually drops a couple pounds.
Re: synthetic versus conventional weight? [Re: BobR] #1253120
06/18/12 02:31 PM 06/18/12 02:31 PM
Joined: Aug 2011
Posts: 117
canada
J
jp15 Offline
member
jp15  Offline
member
J

Joined: Aug 2011
Posts: 117
canada
did you use same brand oil filter on change over???
Had heard of some FRAM filters acting funky

Re: synthetic versus conventional weight? [Re: jp15] #1253121
06/18/12 06:49 PM 06/18/12 06:49 PM
Joined: Nov 2004
Posts: 951
Alliance, Ohio
V
Valiant_Showoff Offline OP
super stock
Valiant_Showoff  Offline OP
super stock
V

Joined: Nov 2004
Posts: 951
Alliance, Ohio
Oil filters are the same. NAPA Gold.

Weird. So the pressure should have dropped?
Re: synthetic versus conventional weight? [Re: Valiant_Showoff] #1253122
06/18/12 09:24 PM 06/18/12 09:24 PM
Joined: Jan 2007
Posts: 7,664
IN
A
ahy Offline
master
ahy  Offline
master
A

Joined: Jan 2007
Posts: 7,664
IN
With real hot oil, the synthetic may hold a higher actual viscosity but it really does sound like you could run lighter oil... I bet 10W30 would work fine and put less load on the pump and drive. I'm happy with 20+ PSI at hot idle and 60 ish at speed.

Moderated by  Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer 
Privacy Policy · Forum Rules · Mark All Read Contact Us · Moparts




Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive


Powered by UBB.threads™ PHP Forum Software 7.7.1