What oil weight should I use?

302 LX Eric · 10-06-2003, 08:48 AM

For my 331 with 10:1 compression heading into the cold season?

Thanks,
E

QuantumMotorsports · 10-06-2003, 02:06 PM

Depends on how the motor was built, ask the machine shop who did the work, or the company you bought it from what oil is to be used for what temperature ranges. Depends on the bearings, rings, things like that.

Rev · 10-06-2003, 11:37 PM

If you use a full synthetic like Mobil1, then 5W30 will work for almost any reasonable clearances and at almost any climate.

At the north pole you might need 0W30 or an engine warm up banket, LOL.

Rev

raptor · 10-07-2003, 04:28 PM

I'd like to add to this post. I have a 331 9.5.1 and I'm using 5w50 syn. I used 10w30 conventional for the first 500miles after buildup. Now ever since buildup I loss about 1/2 quart of oil after about 2 weeks of hard driven. (I drive like a nut) My plugs look great all 8 of them look the same, good burn. I have no leaks anywhere. Where is this oil going? Does syn oil burn different? Should I try a different wieght of oil?

10-06-2003, 08:48 AM	#1
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	What oil weight should I use? For my 331 with 10:1 compression heading into the cold season? Thanks, E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

10-06-2003, 02:06 PM	#2
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	Depends on how the motor was built, ask the machine shop who did the work, or the company you bought it from what oil is to be used for what temperature ranges. Depends on the bearings, rings, things like that. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

10-06-2003, 11:37 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Mobil1 If you use a full synthetic like Mobil1, then 5W30 will work for almost any reasonable clearances and at almost any climate. At the north pole you might need 0W30 or an engine warm up banket, LOL. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

10-07-2003, 04:28 PM	#4
raptor Registered Member Join Date: Sep 1999 Location: Dundalk, Ont, Canada Posts: 129	I'd like to add to this post. I have a 331 9.5.1 and I'm using 5w50 syn. I used 10w30 conventional for the first 500miles after buildup. Now ever since buildup I loss about 1/2 quart of oil after about 2 weeks of hard driven. (I drive like a nut) My plugs look great all 8 of them look the same, good burn. I have no leaks anywhere. Where is this oil going? Does syn oil burn different? Should I try a different wieght of oil? __________________ 88GT, 331Stroker,FMS 70mm TB,77mm Pro-M mass air,Ram Air,K&N,GT40/Exployer Intakes,Gasket Matched,FMS 24lb injectors,Crane hi-6 ignition system,B303 cam,Crane 1.6RR,FMS underdrive pullies,351W/heads,port/polish,FMS h/f oil pump,Hedman headers,2 1/2in H pipe Flow Masters,190lph Holley fuel pump,Center Force dual friction,FMS 3.55,Hurst short throw/ trigger T handle,Subframe connectors,Welded torque boxes.

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