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Guys it is ridunkulous to say to "not do this" or not drive it hard and immediatly change it out! Lets take it a step further and say you used an oil with a "0" viscosity rating. 1 quart would barely dilute the mix to be a difference, let alone a 30 or 40 weight instead of a 60 for 8/9ths of the mixture. Do the math. Using one quart of 5/30 would give you a weight of 57 when averaging the mix. So if you think 10w60 is so much more protective than 10w57 than by all means get to the dealer asap!
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