Does this Oil suitable for 1999 chevy silverado 2500 186000 miles?

I have been using full synthetic oil in my 98 Silverado 5.7. I now have 364k miles with no engine issues at all. I'd recommend it for anything that takes 5w30

Does the Castro 5w-50 SPT meet the Ford spec WSS-M2C931-B for the GT 500?

Castol says it meets the spec, and Ford SVT has approved Castrol 5W50 for use in the GT500. I use this oil in my 2013 GT500.

is current product dexos 1 approved. I see it on the quart, but not on the 5 quart and wondering if it is an old picture

"Approved - GMdexos1™ supersedes GM-LL-A-025, GM6094M and GM4718M" This is indicated on the 5W-30 Castrol Edge High Mileage data sheet, dated 09Nov15. On their latest data sheet dated 20Sep17, this approved statement is no longer indicated. 1 quart size or 5 quart size makes no difference. If the product was made after 20Sep17 then it is not likely to be approved for engines requiring dexos1. I would safely assume the bottle labeling will reflect whether or not using this as a suitable substitute over dexos1 type oil is acceptable. The picture is old and will, or should, be changed so their is no confusion.

I ordered this and it came with the letters SAE in front of the 5w-30, does it matter?

SAE refers to the grading system. There are actually thicker Euro 5w-30 oils, but this is a thin 5w-30 for American and Asian cars. This particular blend is the latest additive formulation for GDI / turbo engines, it should be one of the best products on the market.

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🛠️ Engineered to keep you miles ahead—because your ride deserves the edge.

LEAK BURNOFF DEFENSE - Formulated to reduce leaks and oil burnoff, preserving engine power and efficiency.
FULL SYNTHETIC STRENGTH - Premium 5W-30 viscosity ensures smooth starts and optimal engine health under all conditions.
EMISSION SYSTEM GUARDIAN - Advanced Phosphorus Replacement Technology extends emission system life for cleaner, greener rides.
LONG LASTING PERFORMANCE - Drive up to 15,000 miles or 1 year without oil change—maximize uptime and minimize hassle.
TOP TIER INDUSTRY STANDARDS - Meets or exceeds API SP/SN PLUS and major OEM specs for trusted, high-performance protection.

CastrolEDGE High Mileage 5W-30 is an advanced full synthetic motor oil designed for vehicles with higher mileage. Featuring Phosphorus Replacement Technology, it protects emission systems while reducing leaks, oil burnoff, and deposits. With up to 15,000 miles between oil changes and compliance with top industry standards, it delivers superior engine performance and longevity.

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Manufacturer	Castrol
Brand	Castrol
Model	06128-6PK
Product Dimensions	24.45 x 19.37 x 23.66 cm; 5.49 kg
Item model number	15979F-6PK
Manufacturer Part Number	06128-6PK
Item Weight	5.49 Kilograms
Viscosity	5W 30

CastrolEDGE High Mileage 5W-30 Advanced Full Synthetic Motor Oil, 1 Quart, Pack of 6

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