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    Changing engine oil spec after 22,000 miles

    Hello, As title says, i would like to switch to a different grade of oil. I run a Toyota Diesel 2.2d4d over in the UK. Manual says i should run it on 5w/30 but dealer has performed 2 services 10 & 20k using 10w/40 shell oil. Firstly if they are using the wrong grade, what potentially could...
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