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 longer, perform stronger — the ultimate high-mileage oil upgrade!

API SP SN PLUS CERTIFIED - Meets or exceeds the latest industry standards for superior engine protection and performance.
EXTENDED SERVICE INTERVAL - Go up to 15,000 miles between oil changes, saving time and maintenance costs without compromising quality.
LEAK BURN OFF REDUCTION - Minimizes oil leaks and burn-off, ensuring consistent engine power and efficiency.
ENGINEERED FOR HIGH MILEAGE - Specifically formulated for vehicles with 75,000+ miles to maintain peak performance and longevity.
ADVANCED PHOSPHORUS REPLACEMENT - Protects catalytic converters and exhaust systems by reducing harmful phosphorus deposits.

Castrol EDGE High Mileage 10W-40 is a premium full synthetic motor oil designed for vehicles with over 75,000 miles. Featuring advanced phosphorus replacement technology, it protects your exhaust system while reducing leaks, oil burn-off, and power-robbing deposits. Certified to meet API SP/SN PLUS standards, it supports extended oil change intervals up to 15,000 miles, delivering superior engine performance and durability.

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Manufacturer	Castrol
Brand	Castrol
Model	15D53C
Product Dimensions	24.45 x 19.37 x 23.66 cm; 5.42 kg
Item model number	15989F-6PK
Item Dimensions L x W x H	24.4 x 19.4 x 23.7 cm
Viscosity	10W-40
Color	orange (amber)
Fuel Type	gasoline
Item Weight	5.42 Kilograms

Castrol EDGE High Mileage 10W-40 Advanced Full Synthetic Motor Oil, 1 Quart, 6 Pack

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