What quantity am i getting? what does "3x1/5q" in the title description mean?

5 quarts. I don't know what 3x1/ means, but it's 5 quarts. You can see it on the label in the picture.

can i use this on 1975 chevy k20 pickup truck w/400 small block? mostly cruising around town

The main reason I use this oil product is because it meets/exceeds the zinc additive levels required for the flat tappet cam on my GM 327 V8. The engine is very happy with it and oil changes show exceptional wearability. That said, you'll want to conduct your own evaluations of oil products for your engine application.

Can use this in a 67-68. Chevy 350 engine for my 59 chevy truck?

Yes, that engine needs zinc. Flat tappet

Is this full synthetic?

If you just take the time to read it all.. Lucas oil for Hot Rods & Muscle cars is recommended for most engines from the 50s,60s &70s that were designed to use a conventional oil like what was available back then...It has additives like zinc that are not found in today's oils & therefore,it is NOT compatable with any cars with catalatic converters,(emissions controll system) & No,it is not a synthetic oil, it is conventional, which means it is petroleum based.

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🛠️ Keep your classic roaring and flawless—because legends deserve legendary oil.

SMOOTH QUIET RIDE - Optimizes oil pressure in worn engines for a cool, quiet, and efficient drive.
RUST CORROSION SHIELD - Protects your prized engine from damaging elements, preserving value and performance.
TIME SAVING MAINTENANCE - Extended oil life means fewer oil changes—more time enjoying the road.
ENGINE ARMOR FOR CLASSICS - Specifically crafted for muscle, showroom, and trophy cars without catalytic converters.
PRECISION FIT PERFORMANCE - Vehicle-specific formula ensures peak performance tailored to your classic car.

Lucas Oil 10683 Hot Rod & Classic Car SAE 10W-40 Motor Oil is engineered for muscle and classic cars without catalytic converters, delivering superior rust and corrosion protection, enhanced oil pressure for worn engines, and extended drain intervals to reduce maintenance frequency—all in a 5-quart package designed to keep your prized vehicle running smooth and quiet.

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€ 117.25

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Viscosity	10W 40 sae_grade
Brand	Lucas Oil
Vehicle Service Type	Car
UPC	049807106836 049807406837
Global Trade Identification Number	00049807106836
Manufacturer	LUCAS OIL
Size	Pack of 1
Model	Lucas Oil 10683 Hot Rod & Classic Car SAE 10W-40 Motor Oil - 5 Quart
Item Weight	9.6 pounds
Product Dimensions	12 x 8.25 x 4.75 inches
Item model number	LUC10683
Manufacturer Part Number	10683
OEM Part Number	10683

Lucas Oil 10683 Hot Rod & Classic Car SAE 10W-40 Motor Oil - 5 Quart

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