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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COP 245061

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

FUTURE PROOF YOUR ENGINE - Advanced LXE Technology fills additive gaps, protecting modern engines from wear and sludge.
WARRANTY SAFE PERFORMANCE - Enhance engine protection without risking your OEM warranty—drive with confidence.
COOLER ENGINES PEAK POWER - Lower engine oil temperatures while unlocking optimized horsepower and performance.
ENGINE OILS BEST FRIEND - Extend your oil’s lifespan by 30%, saving you time and money on maintenance.
CUT FRICTION BOOST MILEAGE - Slash engine friction by up to 29% for smoother rides and better fuel economy.

Lubegard 30916 Heavy Duty Engine Protectant uses cutting-edge Liquid Wax Ester (LXE) Technology to reduce friction by up to 29%, extend engine oil life by 30%, and optimize horsepower—all without voiding OEM warranties. Designed to supplement modern motor oils by replenishing depleted additives, it keeps engines cooler, cleaner, and performing at their best, making it an essential upgrade for any serious vehicle owner.

Specifications

ASIN	B006HI8H90
Best Sellers Rank	#148,332 in Automotive ( See Top 100 in Automotive ) #412 in Engine & Parts Fluid Cleaners
Brand	Lubegard
Customer Reviews	4.7 4.7 out of 5 stars (108)
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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