Engine oil question

In the hand book of my Diesel SUV says to use 5W-30 Oil. Can I use is even after 100000 mileage?

Hey Scotty,

Greetings from Sri Lanka!

In the hand book of my Diesel SUV says to use 5W-30 Oil. Now it's 100000 miles. My local dealer says I must move to 15w-40. Is this true? Or can I use 5W-30 forever?

Kind Regards,

Dilan

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