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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LUC10683 10W-40 Petroleum Oil - 5 Quart Jug

LUC10683 10W-40 Petroleum Oil - 5 Quart Jug

Product ID: 391419749

Details

Brand
Lucas Oil
Liquid Volume
5 Quarts
Package Information
Jug
Vehicle Service Type
Truck
Viscosity
10W-40

🏁Compatible with methanol & racing fuels

🔥High thermal stability prevents overheating

⚙️10W-40 viscosity for versatile engine protection

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12694436₫

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Description

🏎️ Power your ride with Lucas Oil – where performance meets endurance!

TRUSTED BY PROS - 4.8-star rating from 785 reviews proves it’s the go-to oil for serious truck owners.
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 deliver durable film strength between pistons and cylinders.
RACE READY COMPATIBILITY - Works seamlessly with methanol and all racing fuels—no compromises.

Lucas Oil LUC10683 10W-40 Petroleum Oil is a premium 5-quart jug of high-performance motor oil designed for trucks. Featuring a paraffinic base and advanced additives, it offers superior film strength, thermal stability, and protection for flat tappet cams. Compatible with methanol and racing fuels, it’s trusted by professionals and rated 4.8 stars by hundreds of users.

Specifications

ASIN	B009M64CUM
Brand	Lucas Oil
Brand Name	Lucas Oil
Compatible with Vehicle Type	Truck
Container Type	Jug
Country of Origin	USA
Customer Reviews	4.8 out of 5 stars 785 Reviews
Global Trade Identification Number	00049807106836
Item Weight	4.35 Kilograms
Liquid Volume	5 Quarts
Manufacturer	jug
Manufacturer Part Number	10683
Package Information	Jug
UPC	049807406837
Vehicle Service Type	Truck
Viscosity	10W-40

Reviews

J**Z

lucas classic oil

7.03.2026

S**D

Top engine oil

19.08.2025

S**A

the right stuff for my 65 N

1.11.2025

L**1

Highly recommended for older engines

17.02.2026

J**T

High zinc great for classic vw

10.07.2025

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12694436₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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