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.

Lucas Oil 10683 Hot Rod And Classic Motor Oil Sae

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Power your classic ride with legendary protection!

FUEL FLEXIBILITY - Seamlessly compatible with methanol, racing fuels, synthetic & non-synthetic oils for versatile performance.
RACE READY VISCOSITY - 10W-40 grade ensures optimal oil film strength and pressure in both cold starts and high heat.
TAILORED FOR CLASSICS - Specifically engineered for muscle, trophy, and vintage cars without catalytic converters.
ULTIMATE ENGINE ARMOR - High zinc, molybdenum & phosphorus formula shields classic engines under extreme conditions.
RUST CORROSION DEFENSE - Marine-grade additives protect engines during long off-road storage, preserving showroom shine.

Lucas Oil 10683 Hot Rod & Classic Motor Oil SAE 10W-40 is a premium 5-quart motor oil designed for muscle and vintage cars. Fortified with a high zinc additive package (2100 ppm) plus molybdenum and phosphorus, it delivers superior wear protection, improved film strength, and corrosion resistance. Compatible with methanol and all racing fuels, it excels in both cold starts and high operating temperatures, making it the go-to choice for classic car enthusiasts and racers seeking ultimate engine longevity.

Specifications

ASIN	B009M64CUM
Automotive Fit Type	Universal Fit
Best Sellers Rank	53,086 in Automotive ( See Top 100 in Automotive ) 556 in Car Engine Oils
Brand	Lucas Oil
Brand Name	Lucas Oil
Compatible with Vehicle Type	Car
Container Type	Jug
Customer Reviews	4.8 out of 5 stars 838 Reviews
Global Trade Identification Number	00049807106836
Included Components	1 x Lucas Oil Hot Rod and Classic Motor Oil SAE 10W-40 - 4.73 L
Item Type Name	Hot Rod & Classic Motor Oil SAE 10W-40 - 4.73L
Item Weight	4.35 Kilograms
Liquid Volume	5 Quarts
Liquid volume	5 Quarts
Manufacturer	Lucas Oil Products Inc
Manufacturer Part Number	10683
Manufacturer Warranty Description	No Warranty
Model Number	LUC10683
Package information	Jug
SAE J300 Viscosity Grade	10W-40
Size	5 Quart
UPC	049807406837
Unit Count	160.0 millilitre
Vehicle service type	Car
Viscosity Level	Medium to High

Reviews

S**D

Top engine oil

Yes, this is expensive stuff but if you want the ultimate wear protection for older engines you can’t get much better than this.

19.08.2025

J**T

High zinc great for classic vw

Bought for early vw due to high zinc levels worked well

10.07.2025

S**A

the right stuff for my 65 N

good for mine 65 corvette from john

1.11.2025

J**S

Good product.

High zinc, can't go wrong for a flattappet engine.

10.05.2026

7**A

As avertized

Good oil for you hot rod

1.10.2025

W**Y

Temperature is just right.....

This oil isn't cheap but it works well as far as the car's temperature staying where it belongs (in a 289 2V Ford engine) and the car runs as smooth as it ever has. No worries about adding Zinc either

7.11.2018

P**A

Great for older vehicles

Awesome high zing oil for 46 Plymouth. Stopped oil leaks.

26.04.2026

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