Why does buying a 6 pack cost $55 but buying 1 for $7.50 six times cost $45?

Because the single one is high mileage, not advanced synthetic.

is this oil suitable for gasoline engines with 200.000 km milage?

I'm sure it is. I have a 2004 Toyota Corolla with 100,000 miles on it. I have used various brands of fully synthetic oil in it from day 1. The car doesn't look as good as new, but the engine seems to still be performing like new.

I am seeing castrol edge 10w30 black quart and 10w30 gold quart with titanium. The gold quart is cheaper than the black. Which is better?

The 10w30 gold quart is extended performance. It should last longer in your engine before you need to change it.

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⚙️ Drive stronger, last longer — the high-mileage edge your engine deserves!

LEAK DEPOSIT DEFENSE - Reduces leaks, oil burn-off, and power-robbing deposits to keep your engine running clean
FUEL EFFICIENCY BOOSTER - Improves fuel economy so you save more on every drive
UNIVERSAL HIGH MILEAGE FIT - Optimized for vehicles with over 75,000 miles, ensuring long-term engine health
PRECISION VISCOSITY CONTROL - 10W-30 viscosity grade delivers reliable performance in diverse driving conditions
TITANIUM STRONG PERFORMANCE - Engineered with extra fluid titanium technology for maximum durability beyond 75,000 miles

CastrolEDGE High Mileage 10W-30 is an advanced full synthetic motor oil designed specifically for vehicles with over 75,000 miles. Featuring titanium-boosted oil film strength, it reduces leaks, oil burn-off, and deposits while improving fuel economy and maximizing engine performance for both short and long-term durability.

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Viscosity	0W-20 sae_grade
Brand	Castrol
Vehicle Service Type	Car
UPC	079191261293
Automotive Fit Type	Universal Fit
Global Trade Identification Number	00079191261293
Manufacturer	Castrol
Size	1 Quart
Model	06129
Item Weight	1.9 pounds
Product Dimensions	2.5 x 4.4 x 8.75 inches
Item model number	15979B
Manufacturer Part Number	15D47C-6pk

CastrolEDGE High Mileage 10W-30 Advanced Full Synthetic Motor Oil, 1 Quart

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