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Fluids and Lubricants Motor oil, transmission oil, radiator fluid, power steering fluid, blinker fluid... wait, there is no blinker fluid. Technical discussion and analysis of the different lubricants we use in our cars.

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Old 05-31-2006, 10:14 PM   #1
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5w-30 versus 10w-40

i was short on time and i had an oil change done at a shop i used to goto. The damn guy was putting in 10w-40 of this proline brand and I caught him right when he was finishing off the first quart. I told him to put in 5w-30 and he said sorry no can do. He then says to me that for older, higer mileage engines, it's better to use a thicker oil because there are gaps everywhere within the engine because of longtime use. I told him to shove it, didn't pay, and bounced.

I've been using 5w-30 for 2 years now and i have 10w-40 in there now. should I be worried? should I do more frequent oil changes for the next couple intervals to get all the 10w-40 out and 5w-30 in? i need to find a nice oil catch pan to store used oil. thanks for reading
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Old 05-31-2006, 11:25 PM   #2
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You shouldn't worry too much...however, 5w-30 is the factory recommended oil...so I suggest you take it to another shop and have them put in 5w-30...

Walmart sells some nice oil cointainers...you can get a 15qt one (huge) for only like $8-$9
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Old 06-01-2006, 06:05 AM   #3
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I was running 5W 30 Castrol GTX for a long time. That stuff feels like light machine oil when its hot and almost runs like water. I recently switched to Geman Castrol 0-W30 which is a little thicker. The engine runs a lot quieter.

I wouldnt freak out about the heavier weight oil.
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Old 06-01-2006, 07:19 AM   #4
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Don't sweat the 10w40 in there for the summer but I'd definitely go back to the 5w30 for the winter in Jersey.
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Old 06-01-2006, 09:59 AM   #5
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10W40 isn't recommended as per the user's manual.
BTW, 10W40 is definetly thick oil for the NE by any stds!!!
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Old 06-01-2006, 01:42 PM   #6
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Quote:
Originally Posted by kbmaxima
i was short on time and i had an oil change done at a shop i used to goto. The damn guy was putting in 10w-40 of this proline brand and I caught him right when he was finishing off the first quart. I told him to put in 5w-30 and he said sorry no can do. He then says to me that for older, higer mileage engines, it's better to use a thicker oil because there are gaps everywhere within the engine because of longtime use. I told him to shove it, didn't pay, and bounced.

I've been using 5w-30 for 2 years now and i have 10w-40 in there now. should I be worried? should I do more frequent oil changes for the next couple intervals to get all the 10w-40 out and 5w-30 in? i need to find a nice oil catch pan to store used oil. thanks for reading
buy ur own oil and bring it over to me... i'll change it in no time... with watever oil u want...
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Old 06-01-2006, 04:10 PM   #7
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Originally Posted by KabirUTA13
buy ur own oil and bring it over to me... i'll change it in no time... with watever oil u want...
i may take u up on your offer. u frequent the downtwon area in paterson a lot?
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Old 06-03-2006, 10:33 PM   #8
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Quote:
Originally Posted by steven88
You shouldn't worry too much...however, 5w-30 is the factory recommended oil.
That is the factory recommended weight for oil in the USA. But in Europe (I've been told) that Nissan recommends 10W30 weight -- which is the weight I use in the summer and 5W30 in the winter.

I would not worry about the heavier weight oil for the summer, but certainly change to a lighter weight by fall.

I'm told that Honda now recommends only 5W20 weight oil for all of their engines in the USA. Now that is a light weight oil.
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Old 06-06-2006, 05:14 PM   #9
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um, this is why i don't go to those places...the one by my was just cleaning the filter and leaving the oil...and they did that for a bit then got in deep ****
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Old 06-06-2006, 05:28 PM   #10
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Quote:
Originally Posted by kbmaxima
i was short on time and i had an oil change done at a shop i used to goto. The damn guy was putting in 10w-40 of this proline brand and I caught him right when he was finishing off the first quart. I told him to put in 5w-30 and he said sorry no can do. He then says to me that for older, higer mileage engines, it's better to use a thicker oil because there are gaps everywhere within the engine because of longtime use. I told him to shove it, didn't pay, and bounced.

I've been using 5w-30 for 2 years now and i have 10w-40 in there now. should I be worried? should I do more frequent oil changes for the next couple intervals to get all the 10w-40 out and 5w-30 in? i need to find a nice oil catch pan to store used oil. thanks for reading
don't sweat it, 10-40 is fine in the summer. (if not better) But buy your own oil & filter next time. Most of those places use the cheapest stuff they can get.
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Old 06-06-2006, 08:38 PM   #11
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Quote:
Originally Posted by Love_00_Max
10W40 isn't recommended as per the user's manual.
BTW, 10W40 is definetly thick oil for the NE by any stds!!!
I don't know about older VQ series engines, the the manual for my 04 G35 specs three grades of oil, 5w-30, 10w-30, and 10w-40. It does say that the 5w-30 is preferred. I've been running GC in my VQ35 too (just over 12 cSt or almost a 40wt itself), and it runs noticeably quieter and smoother than it does when fed a 10 cSt oil. I wouldn't be worried at all, unless perhaps you were in the throes of the coldest of winters. Lose no sleep over this one.
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Old 06-06-2006, 09:21 PM   #12
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Quote:
Originally Posted by kbmaxima
i may take u up on your offer. u frequent the downtwon area in paterson a lot?
i live near paterson... d/t is bout 5 min from me...
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Old 06-06-2006, 09:21 PM
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