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Old 06-07-2015, 01:04 AM   #1
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When to use synthetic oil

So I just recently rebuilt my foxs 5.0 it's now a 306 h/c/I full bolt on motor, all the goods. I did my break in period then ran castrol conventional oil and since changed it twice. The motor now has about 1100 miles on it. So I'm wondering when is a good time to switch to a synthetic oil?? And what weight ? I live in Az as well.


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Old 06-07-2015, 01:31 AM   #2
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You can switch to synthetic whenever it's just a more refined oil. As far as where you live in the hotter climates,5w30 or 10w30 would work fine. I'd recommend oil like the Mobil 1 synthetic sense it has really good high temperature protection.


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Old 06-07-2015, 10:22 AM   #3
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Now is fine. Just be aware that regular Mobil 1 is not a true full synthetic, the Extended Performance variant is. That said, you will be totally fine with a good blend like Motorcraft or Super Tech or whatever. 10w-30 for a pushrod in warm weather.

If you are really feeling froggy, Royal Purple is on sale on Amazon right now.

Amazon.com: Royal Purple 51130 API-Licensed SAE 10W-30 High Performance Synthetic Motor Oil - 5 qt.: Automotive

I honestly don't think its necessary vs $17.99 for the same amount of oil from Wal Mart in the form of Motorcraft/Super Tech blend but if you are going for a real "full synthetic" you won't do much better price wise than that RP.
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Old 06-07-2015, 04:35 PM   #4
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Okay awesome ! And Yea Mobil 1 was my first thought.


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Old 06-07-2015, 04:52 PM   #5
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when changing to a synthetic oil what weight to use? 5w 20?
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Old 06-07-2015, 05:19 PM   #6
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Weight has nothing to do with syn vs conventional. 10w30 is what you should be rolling with. 5w30 if you wanted something thinner for startup but in AZ I doubt your need it. I ran nothing but 10w30 in all my pushrods.

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Old 06-07-2015, 06:24 PM   #7
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Also just took a gander at Mobil1 on Amazon and the Ford filters. $26 shipped for 5 quart jug of M1. $3.60 shipped for a MC filter. Pushrod 5.0 takes 5 quarts so you're paying $30 for ridiculously good oil and a very good filter dropped off at your door, no dealing with the dregs at Wal Mart. You can also get the WIX filter on Amazon.

I've been whoring Rockauto a lot lately but TBTH... Amazon is one of the best places to buy parts/fluids/ANYTHING from these days. I will always be buying all my oils and stuff from them from now on. Wife has Prime so 2 day free shipping on everything.

You will not go wrong with M1.
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Old 06-08-2015, 03:04 PM   #8
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I will also say 10w30 is pretty much what you want. I would also speak with whoever rebuilt your motor and see what the clearances were like.
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