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

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

Product ID: 15573954

Details

Brand
Lucas Oil
Liquid Volume
5 Quarts
Package Information
Bottle
Vehicle Service Type
Car
Viscosity
10W 40 SAE

🔥High-temp stability

❄️Excellent cold start flow

🛡️Zinc & molybdenum fortified

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$U6744

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Details

Brand
Lucas Oil
Liquid Volume
5 Quarts
Package Information
Bottle

Description

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

MUSCLE CAR MASTERY - Specifically engineered for classic and trophy cars without catalytic converters, preserving vintage power.
ALL SEASON PERFORMANCE - Maintains optimal viscosity from cold starts to scorching engine temps for smooth rides year-round.
ULTIMATE ENGINE SHIELD - Loaded with zinc, molybdenum, and phosphorous for unbeatable wear and corrosion protection.
FUEL COMPATIBILITY FLEX - Works seamlessly with methanol, racing fuels, synthetic and conventional oils—versatility that wins.
EXTENDED DRAIN INTERVALS - Save time and money with longer-lasting oil that keeps your engine running cleaner, longer.

Lucas Oil 10683 Hot Rod & Classic Car SAE 10W-40 Motor Oil is a premium, zinc-rich formula designed to protect and enhance the performance of muscle, classic, and trophy cars without catalytic converters. It offers superior rust and corrosion resistance, excellent cold temperature flow, and high-temperature stability, compatible with a wide range of fuels and oils. Trusted by enthusiasts for extending engine life and reducing maintenance frequency.

Specifications

ASIN	B009M64CUM
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#1,380 in Automotive ( See Top 100 in Automotive ) #47 in Motor Oils
Brand	Lucas Oil
Brand Name	Lucas Oil
Compatible with Vehicle Type	Car
Container Type	Bottle
Customer Reviews	4.9 out of 5 stars 1,160 Reviews
Global Trade Identification Number	00049807106836
Included Components	1x 5 Quart Bottle
Item Type Name	motor oil
Item Weight	0.01 Ounces
Liquid Volume	5 Quarts
Manufacturer	Lucas Oil
Manufacturer Part Number	10683
Manufacturer Warranty Description	30 Days
Model Number	LUC10683
Package Information	Bottle
Part Interchange Info	10683
SAE J300 Viscosity Grade	10W-40
Size	Pack of 1
UPC	049807406837
Unit Count	160.0 Fluid Ounces
Vehicle Service Type	Car
Viscosity Level	Medium to High

Reviews

P**A

26.04.2026

J**Z

7.03.2026

L**1

17.02.2026

C**N

3.05.2025

M**N

16.04.2026

T**Y

5.05.2025

J**N

4.04.2026

S**R

30.03.2026

S**D

19.08.2025

S**A

1.11.2025

J**T

10.07.2025

S**L

4.10.2025

7**A

1.10.2025

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