Difference between 5W-30 and 5W-40

these 2 motor oils are multi-weight oils meaning they act like a 5w oil when cold and then the higher number weight oil 30/40 when at operating temperature. you should use the oil weight recommended by the manufacturer as listed in the owner's manual.

Could someone tell me the difference between the ultra in the black bottle and the regular in the silver/grey bottle? Is one better than the other?

The ultra is there premium full synthetic the silver is there standard full synthetic filter great quality oils I use both

Is this oil suited for my 2005 BMW x3 ?

Yes this is a excellent choice for your BMW X 3

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Pennzoil 550020166-6PK Ultra 5W-30 Full Synthetic Motor Oil - 1 Quart (Pack of 6)

Product ID: 72021984

Details

Brand
Pennzoil
Liquid Volume
32 fluid
Package Information
Bottle
UPC
071611000703
Vehicle Service Type
Car

⏳Thermal & viscosity stability

🔥Ultimate engine protection

🧼Dissolves contaminants

Description

🏁 Drive like a pro, protect like a champion.

DEPOSIT FREE ENGINE - Actively dissolves contaminants to prevent sludge and harmful deposits, keeping your engine pristine.
LOW CHLORINE FORMULA - Minimizes harmful chemical content for cleaner, safer engine operation.
RACE PROVEN PERFORMANCE - Engineered with Formula 1 & NASCAR tech for peak power and smooth revs.
CORROSION WEAR DEFENSE - Reduces engine wear and corrosion for longer-lasting performance and reliability.
EXTREME CONDITION ENDURANCE - Maintains oil stability and protects against breakdown even under intense heat and stress.

Pennzoil Ultra 5W-30 Full Synthetic Motor Oil delivers race-tuned engine protection and performance, leveraging decades of Shell and Pennzoil motorsport expertise. Its advanced formula ensures thermal and viscosity stability, dissolves contaminants before they form deposits, and guards against sludge, corrosion, and engine wear—perfect for professionals who demand reliability and smooth engine operation in every drive.

Specifications

ASIN	B00752POPC
Best Sellers Rank	#5,325,260 in Automotive ( See Top 100 in Automotive ) #6,718 in Motor Oils
Brand Name	Pennzoil
Compatible with Vehicle Type	Car
Container Type	Bottle
Customer Reviews	4.1 4.1 out of 5 stars (90)
Global Trade Identification Number	00071611000703
Liquid Volume	32 fluid ounces
Manufacturer	Pennzoil
Manufacturer Part Number	550020166
Model Number	550020166-6PK
Size	1 Quart, Pack of 6
UPC	071611000703

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