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2005-2010 Mustang Talk Forum

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Unread 08-13-2008   #1 (permalink)
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Default SAE 5W-30 vs. 5W-20 motor oil in an '07 V6

first, i wanna say that this belongs in the tch section, but it concerns both a GT and a V6, so i'll just have to put it in the '05+ talk...

anyway, heres the story...

i own a '07 V6 mustang. i do all the regular maintaince on it myself, with a little help from my dad. the big stuff i leave to the certified mechanics of course. well, today i was changing the oil. after draining it and removing the oil filter, i go and grab my new oil. well, i've always used castrol syntec 5W-30, and i pick up the new oild from the garage floor, i notice i somehow got the wrong one. 5W-20...? well, now i'm thinkin i'm screwed. i don't have another car to drive to the store to exchange it, and i already drained the old oil. well, i go back inside and call up the dealership and ask to speak with the service center. so i'm transfered to a mechanic and i explain to him my situation, in which he immediatly tells me that '07 V6s take 5W-20. at that point, i'm thinking "crap! now i've been putting the wrong oil in my car since i first got it just over a year ago!" but, i go back down and begin to pour the new oil into the engine... well, as its draining, i start to have second opinions, so i go in the glove box and pull out my owners manual and flip to the page with the oil changing procedure... sure enough, it says the following... 4.0L, V6: 5qts SAE 5W-30. 4.6L, V8: 6qts SAE 5W-20. well, crap... so now i was right all along... so here are my questions:

first of all, does it matter (to a point like this) what oil you use? i know the V8 takes 6qts instead of 5 because its a slightly bigger engine. but why the 5W-30 for the V6 and the 5W-20 for the V8? and is this going to be harmful in any way for my engine now?

afterward i started the car to let the oil circulate. after about 30 seconds (the time i usually wait to do the following) i gave it a little rev to help "mix" it up a little bit more. i got a weird windy sound quite different from the usual "rev sound" i get. and as i took my foot off the gas, the needle dropped unusally fast... now i was starting to get worried... anyway, i puled it out from the garage to the driveway to check for leaks. none were found. i checked the oil, and it looked great, high even. again i reved it a little and got the same effect. so i went inside to ask my dad if he knew what the heck was going on. i left the car running while he looked up a reference chart on the internet (i was using a different oil filter than i normally used, so i had a suspesion that could be causing it) well, i came back down to my car about 3 minutes later. i got in and gave it one more rev. boom. perfect. sounded great. like it always does. i gased it again just to make sure i wasn't imagining things. again, it was perfect. so i pulled it back in the garage noticing it felt a lot smoother than it did when i drove it with the old oil last. thats always a good feeling!:hihi: anyway, my other question is why was it giving me that sound at first? was it taking longer for the oil to circulate because it was different? or was it the different oil filter i was using? my baby is running perfect now, so i'm not worried about any possible damage, but i would really like some answers to these questions. and is there anything i need to look out for when i switch up oils? thanks for any concerns, opinions, and answers!!
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Unread 08-13-2008   #2 (permalink)
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The 5-20 won't hurt anything but I would go back to 5-30 at your next change.
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Unread 08-13-2008   #3 (permalink)
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Originally Posted by stlwagon View Post
The 5-20 won't hurt anything but I would go back to 5-30 at your next change.
will do, but why exactly? and why did the ford mechanic tell me 5-20 was ok, for my V6? maybe he spoke too soon... afterall, he DID kinda interupt me when i was explaining to him what was going on...
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Unread 08-13-2008   #4 (permalink)
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5w-20 and 5w-30 both have pretty much the same start up charachteristics and will flow like a 5 weight oil. The second number how it flows at 100* c. They will both protect your motor.

Dan
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Unread 08-13-2008   #5 (permalink)
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Originally Posted by grimmreaper1221 View Post
will do, but why exactly? and why did the ford mechanic tell me 5-20 was ok, for my V6? maybe he spoke too soon... afterall, he DID kinda interupt me when i was explaining to him what was going on...
Just an FYI: In your owners manual, it says that "Ford Recommends" 5w-30 for V6 and 5w-20 for V8

Pages 217 and 218 of the attached document...
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Unread 08-13-2008   #6 (permalink)
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Quote:
Originally Posted by JudisStang View Post
Just an FYI: In your owners manual, it says that "Ford Recommends" 5w-30 for V6 and 5w-20 for V8

Pages 217 and 218 of the attached document...
...ummm, duh.... thats what i was saying... but its all good now. the car runs perfectly fine as far as i can tell. but just to be safe i'm putting the 5W-30 back into her next oil change. thanks for everyones help and answers.
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Unread 08-13-2008   #7 (permalink)
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Quote:
Originally Posted by grimmreaper1221 View Post
...ummm, duh.... thats what i was saying... but its all good now. the car runs perfectly fine as far as i can tell. but just to be safe i'm putting the 5W-30 back into her next oil change. thanks for everyones help and answers.
You will have to forgive Judy, she lost her marbles.
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Unread 08-13-2008   #8 (permalink)
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You will have to forgive Judy, she lost her marbles.
So you going to go there!!! Not meeeeee
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Unread 08-13-2008   #9 (permalink)
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Quote:
Originally Posted by grimmreaper1221 View Post
...ummm, duh.... thats what i was saying... but its all good now. the car runs perfectly fine as far as i can tell. but just to be safe i'm putting the 5W-30 back into her next oil change. thanks for everyones help and answers.
Duh, wasn't directed at YOU, otherwise I would have addressed YOU... it was for informational purposes for the whole group :hihi:

{got outta that one good...} :hihi:

grimm - Why did you put in the wrong oil if you knew? only kidding.... duh.... :hihi:

{I better start reading the posts, sincere apologies.... }

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So you going to go there!!! Not meeeeee
You are a brilliant man, Drew.
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Unread 08-13-2008   #10 (permalink)
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So you going to go there!!! Not meeeeee
Her Avatar says it loud and clear, I don't make these things up.
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Unread 08-13-2008   #11 (permalink)
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Originally Posted by pcfrisch View Post
Her Avatar says it loud and clear, I don't make these things up.
Yea but it's still safer to just leave that one alone or suffer the rath......
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Unread 08-13-2008   #12 (permalink)
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Originally Posted by JudisStang View Post
Duh, wasn't directed at YOU, otherwise I would have addressed YOU... it was for informational purposes for the whole group :hihi:

{got outta that one good...} :hihi:

grimm - Why did you put in the wrong oil if you knew? only kidding.... duh.... :hihi:

{I better start reading the posts, sincere apologies.... }



You are a brilliant man, Drew.
hehe, i know! i just like giving me people a hard time! that way you get really ridiculous jokes about loosing your marbles n such... haha, no hard feelings!
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Unread 08-13-2008   #13 (permalink)
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Quote:
Originally Posted by JudisStang View Post
Just an FYI: In your owners manual, it says that "Ford Recommends" 5w-30 for V6 and 5w-20 for V8

Pages 217 and 218 of the attached document...
Just an MHO: Mr Ford changes his voice just after the "recommendation", and says "Use ... " I hear the "Use" closer to the action, and bet the Ford lawyers would, too, if you claimed the engine failed because you followed the "Recommendation" rather than the "Use" instruction.

I went back the next day and had the dealership put 5-30 in when I found they had done 5-20 for a routine oil/filter change. The service guy said ~ it was "OK, we do all our bulk oil changes 5-20". I said it wasn't OK with me, and if they want to countermand the Owners' Manual instructions they better ask for permission from me.

I believe V6ers across the system are vulnerable if more servicers than just my local dealer are doing that.

Any road, I figure my treatment of the engine may be enough more strenuous than the majority of drivers who might not need the small amount of additional protection afforded by the heavier hot-flow characteristics of the 5-30 product, to justify the care.

Aside from all that, I'll bet that most engine oils with the right SAE Standards numbers that you'll find on the shelves of oil sellers' stores will make enough of a friction barrier in most engines in most circumstances to preclude early self-destruction.

Any chance of a reward for finding those lost marbles?
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