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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🏎️ Power your ride with precision and protection!

HEAT RESISTANT FORMULA - Exceptional thermal stability keeps your engine cool under pressure.
ULTIMATE ENGINE SHIELD - High zinc content safeguards flat tappet cams and lifters for peak performance.
LONG LASTING LUBRICATION - Paraffinic base oil and additives ensure durable film strength between pistons and cylinders.
TRUSTED AMERICAN QUALITY - Proudly made in the USA, engineered for professional-grade reliability.
RACING READY COMPATIBILITY - Works seamlessly with methanol and all racing fuels—no compromises.

Lucas Oil LUC10683 10W-40 Petroleum Oil is a high-performance lubricant designed for trucks and racing applications. Featuring a paraffinic base oil enriched with additives, it delivers superior film strength and thermal stability. Its high zinc content protects critical engine components like flat tappet cams and lifters, while compatibility with methanol and racing fuels ensures versatility for demanding conditions. Packaged in a convenient 5-quart jug, this USA-made oil is engineered for long-lasting engine protection and peak performance.

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Viscosity	10W-40
Brand	Lucas Oil
Vehicle Service Type	Truck
UPC	049807406837
Global Trade Identification Number	00049807106836
Manufacturer	jug
Product Dimensions	30.48 x 20.96 x 12.07 cm; 4.35 kg
Item model number	LUC10683
Manufacturer Part Number	10683
OEM Part Number	10683
Assembly Required	No
Country of Origin	USA
Item Weight	4 kg 350 g

Lucas Oil LUC10683 10W-40 Petroleum Oil - 5 Quart Jug

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