What about 5w-30 oil on a 98K miles V6? - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 04-03-2011 Thread Starter
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What about 5w-30 oil on a 98K miles V6?

Yesterday I asked on a service station for 5w-20 oil change. The technician told me that he'd recommend a 5w-30 oil because of the high mileage. Was he right, or should I keep using the 5w-20 recommended oil? My pony lives in a tropical area, not too cold, not to hot.

Thanks for any comment!


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post #2 of 10 (permalink) Old 04-03-2011
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I wouldn't do it. The car calls for 5W-20, not some guys opinion. The only consideration for choosing oil weights is temperature, not mileage. Besides that, 5W-20 is either semi-synthetic of full synthetic only compared to 5W-30 that can be any type. Ignore his "advice" and stick to 5W-20.


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post #3 of 10 (permalink) Old 04-03-2011
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it makes no difference, modern oils have so many additives that as long as the oil is changed regularly the motor will be fine. It's been shown that grocery store oil protects as well as full synthetic. Personally I wouldn't test that theory and always run Mobil 1, 10-30 and as a result my Cobra has over 200K miles without an issue, the last 75K with the supercharger.
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post #4 of 10 (permalink) Old 04-03-2011
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Im running 10-30 in my 98 with 130k miles and it gets the same mpg and has been just fine. The thinner 5-20 is designed for start up anti wear since 90% of wear happens at start up. However its being said now that start vs the actual running with any synthetic your engine is protected. Besides all oil once at the operating temp is a 10 w any how, so it all depends on how cold it is in your region that would make the most difference on what weight you use. Your car will be fine as long as its semi or full synthetic. IMO it would be fine even if its a reg oil.
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post #5 of 10 (permalink) Old 04-03-2011
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I'm running 5W-30 as well, Mobil 1 Full Synthetic. I used to take it to a dealer for oil change and they've used 5W-20, then later on used 5w-30. Even on parts counter they tell me to use that since I have now a high mileage. Currently I have 93K+ miles.

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post #6 of 10 (permalink) Old 04-03-2011 Thread Starter
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Thanks guys, I appreciate your replies.

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post #7 of 10 (permalink) Old 04-04-2011
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Quote:
Originally Posted by 2Manystangs View Post
it makes no difference, modern oils have so many additives that as long as the oil is changed regularly the motor will be fine. It's been shown that grocery store oil protects as well as full synthetic. Personally I wouldn't test that theory and always run Mobil 1, 10-30 and as a result my Cobra has over 200K miles without an issue, the last 75K with the supercharger.
That sir is not correct. When you see numerous new 3V F150's come into the Ford dealer with rattling valvetrain because the owner said 5w20 is "too thin" and he stuffs 10w40 in there like his old 70's Ford used to run on, then you will see why Ford says it takes 5w20.

I also wouldn't test the "theory" as well. Manufactures don't run synthetic oils from the factory for hype, it costs too damn much. Parts last longer on synthetic fluids, how else do we have "sealed" auto trannies and 150K+ service intervals on rear-ends? Saves them warranty costs. Only thing I would say is to stick with a certain brand, additives vary (if slighlty) between brands and types. Weird build-ups happen when you go from brand to brand to brand on oils.

I have over 150K on my 01 with 5w20. Unless you have had someone machine larger tolerances into the rotating assembly or have modified the valvetrain to a point where it needs a heavier weight oil, then run what it says on the cap. Why fix what isn't broken?

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post #8 of 10 (permalink) Old 04-04-2011
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I'll just say I used 10w-30 in my '01 for 20k miles. I listened to my dad once and put in 20w-50 in it. He has been a mechanic for 35 years and has been building race cars for 11 years. By the end of that oil change the rear main seal had blow...
Don't always take the mechanics advice. Run what it says to run unless you have problems.
post #9 of 10 (permalink) Old 04-04-2011 Thread Starter
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Thanks Red and Stalker. I totally agree with you.
I had made my decision on 5w20 as the cap and owner's manual say, and your comments make it clearer to me.

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All you will ever need to know about oil plain and simple. so throw all the old tales about what to run and what not to run and when out the door.

http://www.bobistheoilguy.com

enjoy, i know i did, and learned alot.

Last edited by Subpath; 04-04-2011 at 06:29 PM. Reason: left stuff out.
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