1953 Corvette engine oil specifications.

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1953 Corvette Specs
More About the 1953 Corvette
Body Specs
Wheelbase 102 inches
Front Track 57 inches
Rear Track 59.00 inches
Length 167.00 inches
Width 72.24 inches
Height (at Roof) 52.16 inches (Unloaded)
51.25 inches (Loaded)
Turning Circle Wall to Wall
38.58 feet (right); 38.99 feet (left)
Curb to Curb
36.55 feet (right); 36.93 feet (left)
Steering ratio 16.0:1
Steering Wheel Diameter 17 ¼ inches
Shipping Weight
(fuel and water not included) 2,705 lbs.
(Radio / Heater Not Included)
Shipping Weight
(fuel, gas, radio, heater and water not included) 2,705 lbs.
Axle Ratio 3.55:1
Tire Size 6.70-15 4 Ply Rating
Engine Specs
Type: Inline Six Cylinder
Valve Location: In Head
Bore / Stroke: 3 9/16 inch / 3 15/16 inch
Displacement: 235.5 Cubic Inches
Compression Ratio: 8.0 : 1
Horsepower: 150 @ 4,200 RPM
Max. Torque: 223 lb. ft. @ 2,400 RPM
Crankcase Oil Capacity (less filter) 4 Quarts
Recommended Oil Grade Above 32°: SAE 20W
To 10°: SAE 20W
To -10°: SAE 10W
Below -10°: SAE 5W

Fuel Tank 17.25 Gallons
Carburetor Three side draft carburetors - Carter 3706989
Cooling System Capacity 18 ¼ Quarts - With Heater
17 ¾ Quarts - Without Heater
Ignition System
Coil Delco-Remy 1115394
Coil current rating 4 amps
Breaker Gap .016 - .021"
Spark Plug AC 45-5 or 43-5
Firing Order 1-5-3-6-2-4
Centrifugal Advance Start: 224 - 375 RPM
12° - 14° @ 1,750 RPM
Vacuum Advance Start: 4.0 - 6.0 inches Hg
Max.: 13° - 17° @ 10.0 - 7.5 inches Hg
Breaker Gap .013 inch - .018 inch
Initial Timing 2° ATC
Rear Axle Ratio 3.55:1
Wheel Size 15 x 5K
 
Any respectable modern 10W-30 should be fine in that engine.

^^^^^^^^^^^This^^^^^^^^^^^^^^^^ Any dino 10W30.
 
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Maybe a nice Euro oil would work - pretty stout with a good additive pack, BMW LL01 5w30 comes to mind. A high mileage oil like Mobil 1 10w40 HM is darn stout with good low and high temp characteristics and a HTHS of 3.8 IIRC. Both have rich additive packages.
 
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