Does this work in an old classic 1950's car?

this worked great in all engines i have used it in -best additive i have used

If my truck hold 7 quarts of oil do I put in all 7quarts and on top of that then add 21 ounces of Lubegard?

The second answer is correct. Hold back 21 ounces of oil to compensate for adding 21 ounces of Lubeguard. The TOTAL fill will equal 7 quarts. I put 5 quarts of oil in, add the 21 ounces of Lubeguard, then add another 1 quart and 11 more ounces of oil. My truck always comes out right at the full level on the dipstick every time. It's bad to overfill your engine by 21 oz. , I've seen the problems caused by someone doing that.

Is this the same thing as the lubegard 40902 bio/tech engine oil protectant? just different packaging?

it comes up as a different part number but I'd be surprised if it's different, the heavy duty is cheaper, works well to save adding a quart between oil changes.

This additive is compatible with full synthetic oil.

yes, add 3 oz per qt of engine oil, at every oil change. for 5 qts you would put in 15 oz but subtract that amount from the 5 qts so you do not over fill.

Lubegard 30916 Heavy Duty Engine Protectant 32 Fl Oz

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Description

⚡ Drive smarter, not harder — protect your engine like a pro!

EXTEND OIL LIFE - Keep your engine oil fresh 30% longer, reducing maintenance frequency and costs.
OEM WARRANTY SAFE - Enhance performance without risking your vehicle’s factory warranty.
ADVANCED LXE TECHNOLOGY - Replenishes depleted additives to protect against wear, corrosion, and sludge buildup.
POWER PERFORMANCE BOOST - Optimize horsepower and engine responsiveness for that extra edge on the road.
MAXIMIZE ENGINE EFFICIENCY - Slash friction by up to 29% for smoother rides and boosted fuel savings.

Lubegard 30916 Heavy Duty Engine Protectant uses cutting-edge Liquid Wax Ester (LXE) Technology to reduce engine friction by up to 29%, extend oil life by 30%, and improve fuel economy—all without voiding OEM warranties. Designed to supplement modern motor oils by replenishing essential anti-wear and anti-corrosion additives, it keeps engines cooler, cleaner, and performing at peak horsepower. Ideal for professionals who demand reliability and efficiency from their vehicles, this 32 fl. oz. formula is a must-have for every oil change.

Specifications

ASIN	B006HI8H90
Best Sellers Rank	#78,579 in Automotive ( See Top 100 in Automotive ) #271 in Engine & Parts Fluid Cleaners
Brand	Lubegard
Customer Reviews	4.7 4.7 out of 5 stars (109)
Date First Available	December 3, 2011
Item Weight	0.01 ounces
Item model number	30916
Manufacturer	Lubegard
Manufacturer Part Number	30916
Product Dimensions	9.3 x 4.3 x 2.3 inches

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