Would this be great for a 335i N54 with heavy performance mods?

Absolutely, I run it in my Shelby GT350

Can i use it on a 2005 bmw 545i?

The 2005 545i uses 5w30 or 0w40 when in temperatures over 50 degrees F.

Is this good for an old/worn opel zafira b 1.9 cdti, or is it a bit too thick for the system?

I’m sorry I don’t know about your particular car however it went into my 2020 Shelby gt 350 easily, as it is the required viscosity. The oil was not thick like the old 20/50 weight oil it was actually easy to pour. The oil pressure typically runs over 100 lbs in the Shelby if that helps.

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Red Line 11605 Motor Oil

Product ID: 259531106

Details

Brand
Red Line
Liquid volume
1 Gallons
Package information
Jug
Vehicle service type
Car
Viscosity
5W-50

⛽Improved fuel economy

🔥High-temp performance

⚙️Full synthetic ester formula

Description

🔥 Keep your engine cool under pressure with Red Line 11605 – the turbo’s secret weapon!

FRICTION FIGHTER - Reduces wear and friction to keep your engine running smoother, longer.
FUEL SAVVY FORMULA - Boosts fuel economy while enhancing ring seal for maximum power output.
PURE SYNTHETIC POWER - Ester-based formula engineered for peak performance in cars, trucks, and marine rides.
UNIVERSAL COMPATIBILITY - API SN/SM/SL/SJ/SH/SG/CF and ACEA A3/B3/B4 certified for broad vehicle coverage.
ENGINE ARMOR FOR THE HEAT - Designed to dominate high-temperature climates without breaking a sweat.

Red Line 11605 is a premium 5W-50 fully synthetic motor oil featuring an advanced ester formula that excels in high-temperature environments. It offers superior wear protection, friction reduction, and improved fuel economy, making it ideal for performance cars, light trucks, and marine applications. Certified for multiple API and ACEA standards, this 1-gallon jug is trusted by enthusiasts who demand consistent, high-performance engine care.

Specifications

ASIN	B004BORLQM
Automotive Fit Type	Universal Fit
Best Sellers Rank	#58,852 in Automotive ( See Top 100 in Automotive ) #661 in Automotive Oils
Brand	Red Line
Brand Name	Red Line
Compatible with Vehicle Type	Car
Container Type	Jug
Customer Reviews	4.9 out of 5 stars 67 Reviews
Global Trade Identification Number	00083522116053
Included Components	Includes product as described
Item Weight	3 Kilograms
Liquid Volume	1 Gallons
Liquid volume	1 Gallons
Manufacturer	Red Line
Manufacturer Part Number	11605
Model Number	11605
Package information	Jug
SAE J300 Viscosity Grade	5W-50
Size	Gallon
UPC	083522116053 083522116251
Unit Count	1896489.41 Milliliters
Vehicle service type	Car
Viscosity Level	Medium to High

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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