post #1 of Old 10-29-2012, 08:18 AM Thread Starter
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Join Date: Jul 2012
Posts: 7
? 10w40 for a higher milage motor?

i have a 99 xj with the i6. its got 171450 miles. a friends dad suggested that when i get my oil changed at 171500, i should switch from 10w30 to 10w40. said the thicker oil will help preserve my engine; and that he had put 10w40 in his 70 bronco for that reason. wats you thoughts? should i switch or no?

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post #2 of Old 10-29-2012, 09:57 AM
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1990 YJ Wrangler 
Join Date: Jun 2012
Location: Jacksonville
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If your experiencing lower oil pressures the 10W40 will help with that. If your not having any issues I wouldnt worry about it. You could use a "hi mileage" oil if you want but the syntho has a tendency to creep out in spots you didnt have leaks before.
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