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My 95 V6 convert has around 240 000kms on it right now. Now, I love the car and want to keep it as long as I can. I have been running 10w-30 in the summer and 5w in the winter. I would like to go to a heavier weight for protection purposes. Is a 5w50 or mobil 1 15w50 a good decision? I was always told that the older a motor gets a heavier weight oil will offer more protection. Also, How low of a temp could I go to with the Mobil1 15w50?
Thanks. :)
 

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I'm no expert, but i would stick with 40 weight oil. Perhaps 5/10w-40 depending on the season - Full synth of course.

My 900 has about 245k miles and though i just changed it with 30 weight, i will be switching to 40 weight for my next oil change.
 
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