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Generation III Internal Engine
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Old 04-03-2003, 11:28 AM   #1
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Default Can I mix 5W-30 with 10W-30 ?

I'm gonna change my oil in a few days. I usually run Syn 10W-30, but was thinkin about mixing it 50/50 with some Syn 5w-30 cuz the Owner's manual recommends 5W-30.
My car burns a quart per oil change with all 5W-30, and none with 10W-30..I was thinkin the 50/50 mix might be a good idea...is it?
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Old 04-03-2003, 02:20 PM   #2
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Default Re: Can I mix 5W-30 with 10W-30 ?

Not that mixing the two would cause any harm, but I'd just stick with the 10W-30 myself.
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Old 04-03-2003, 03:24 PM   #3
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Default Re: Can I mix 5W-30 with 10W-30 ?

There is simply no need to mix 5w30 and 10w30, stick with the 10w30 in warm weather, and 5w30 for the cold. Or better yet, try out Mobil 1's 0w40 instead. Despite the 0w rating, it's thicker at 40 celcius than 5w30 and 10w30 Mobil 1.

<small>[ April 03, 2003, 02:26 PM: Message edited by: Patman ]</small>
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Old 04-03-2003, 06:28 PM   #4
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Default Re: Can I mix 5W-30 with 10W-30 ?

Go with all 10W-30 if your car is not burning any. Mobil 1's 5W-30 and 10W-30 oils are almost exactly the same when at operating temp. 9.7 cst and 9.8 cst. The 5W-30 has better cold weather properties but would only make a difference at 0 deg and below. 10W-30 M1 will still pump at -49 below zero!!!!
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Old 04-04-2003, 01:43 AM   #5
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Default Re: Can I mix 5W-30 with 10W-30 ?

i use 4 qts 10w30 and 2 qts 15w50 mobil 1.my car did use about 1/2 qt every 2000 miles with 5w30,and hasnt used hardly any since i started doing so. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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Old 04-04-2003, 01:43 AM
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