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Old 01-21-2001, 04:07 PM   #1
bigbird
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Member#: 1685
Join Date: Jun 2000
Location: NISSANTALK.COM / MD
Vehicle:
2001 2.5RS-T FMIC
WHITE

Question Problems switching to synthetic motor oil?

Hey,

I am going to have THE first oil change tommorow, on a 2001 2.5RS 5spd. I am thinking about going 10w-30 mobil synthetic. Is that a good choice? Maybe conventional oil? But I was also wondering, if the engine runs on synthetic, would it be ideal to change all other liquids such as the tranny oil to synthetic as well?

thanks
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Old 01-21-2001, 07:21 PM   #2
Snoopy
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Chapter/Region: MAIC
Location: BANNED!
Vehicle:
99 Impreza RS
Silverthorn Metallic

Post

If your new car has well over 3000 miles on it, yes, change to synthetic. But my advice is to use 5w30. Better rev and better gas mileage. Besides, it's cold in Maryland.

When I switched to 10w30 in late summer, my car didn't rev as easily and gas mileage took a slight dip.
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Old 01-21-2001, 09:23 PM   #3
tahrndt
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Location: Minneapolis, MN. U.S.A.
Question

Why wait to go way past 3k miles? I plan on changing my entire POL (military speak for Petroleum, Oil, Lubricants)at 1,000 mi. This up to and including Diffs and Tranny. I will be running full Mobil syn. The most metal shavings and wear take place during the initial break in. IMHO it is best to remove all those metal particles from the fluids ASAP. Why wait for 30,000 miles of wear and tear to do so. And please dont say that putting synthetics in a new engine will damage it. If that were the case cars like Benz, Jaguar, BMW would NOT come from the FACTORTY with synthetic oils!
I have 600 mi to go before reaching 1000
Tim
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Old 01-21-2001, 09:44 PM   #4
DeliciouSpeed
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07 STImpreza
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You better listen to him man. Synth oil is bad on break in. Break in needs conventional oil with no clensers 10/30 or 0/30. Why, because I forgot, just listen to me though. That synth oil will be burning like crazy and wont break in your motor right. Its way thinner. You will also see a decrease in oil pressure with the change, because synth oil is thinner it requires less pressure to be pumped. That one reason why hp's go up with synth oil. How do I know, Been there.
Just listen damn kids,

Ken
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Old 01-22-2001, 09:22 AM   #5
micah
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Location: Columbia, SC, USA
Post

What the ??? The viscosity numbers for motor oil, I know this is a shock but what they indicate, is viscosity. ie THICKNESS. A 10W-30 synthetic is exactly as thick as a 10W-30 dino.

A) synthetic is just fine for break in, and B) it's a moot point here because at the time of the 1st oil change your engine is as broken in as it's going to get. If you don't believe me take a look at the Mobil web site, but what would they know about oil?

cheers
mbs
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Old 01-22-2001, 10:01 AM   #6
ANZAC_1915
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2008 Forester XT
Steel Gray Metallic

Post

I would trust the engine manufacturer over any oil company.

Most Subaru dealers and Subaru themselves(unofficially) say "don't use synthetic".

They can't say it officially because that would be illegal as the oil meets the same API ratings as multigrade.

The manufacturers that use synthetic from mile 0 have tested their engines this way.

Are Subaru piston rings the same as MBZ? Are Subaru bores machined the same way?

Also, Subaru recommends waiting until 3,000 miles for the first oil change. Every person at Subaru and dealerships and techs I have contacted have been insistant about this. I also noticed a decrease in roughness between 2,000 and 3,000 miles which tells me the engine was still "bedding in" during that time.

I assume there is special break in oil in there though I couldn't see any difference when I drained it.

Again, I am willing to trust the people who designed and built the engine.

Glenn
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Old 01-22-2001, 03:38 PM   #7
ScoobyRoo
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Post

I put in AMSOIL 20w-50 at 500. had engine tested two days later and I had a negligable pwr increase, but my engine was running 14 degrees celcius cooler and the viscosity reading was almost four fold better than natural, I saw a comaprison from another vehicle with natural Pennsoil in it. If you have the dough I would go with the synthetic as soon as possible just stay with it for the remander of the life of the car. I have heard of problems with switching between both kinds, Natural and Synthetic. Get redline if you can also. I don't trust Mobile One seems really thin and almost watery. But that was 15W-50 the closest I could get with it. The AMSOIL had a good texture and was heavier. But it's $8.00 a quart.
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Old 01-22-2001, 05:05 PM   #8
tahrndt
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Wink

The biggest dif in syn vs. "natural" is that all of the molecular structure of syn is the same size. So in "natural" if a given weight of oil is 10w 30. Lets say is money and that would be the size of a quarter. With natural you get molecules the size of dimes and pennies and new funny dollars. But with syn. you get a whole quart of quarter sized molecules.
Tim
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Old 01-23-2001, 10:01 AM   #9
kar250c
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2000 2.5 RS Coupe
Blue Ridge Pearl

Post

The dealer I bought my car from now offers Mobil 1 as an "alternative". They recommend the same weights as conventional. I ran it for 110K in my wife's old car. It still purred when we traded it. I have 17K on my RS and have had it in the crankcase since 3K. Diffs and trans get changed later this month.
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Old 01-23-2001, 10:04 AM   #10
kar250c
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Post

BTW the wife's "old" car was a '95 Impreza 2.2L.
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Old 01-23-2001, 10:15 AM   #11
jlyttle
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Silver

Thumbs down

Synthetic oil does not "burn up like crazy", it's unbelievable what garbage is thrown out as "The Truth". The reality is that syntetics specifically DO NOT break down nearly as quickly as conventional oils. That is what is so good about them. Also, except for some very minor differences, a given weight is a given weight. 10w30 is 10w30. As it has been stated before, most better cars come from the facory with synthetics in the engine. Not the average domestic, but Corvettes, BMS, etc. Like I said, better cars. I am ok with being in that company when it comes to the care that I give my car. Also, I changed to mobil1 10w30 at 1200 miles to get all of the crap out of my engine right away. I did it again 3000 miles later. Please stop saying things if you have no idea what you are talking about. I can't belive that someone actually said that synthetics will be burning up like crazy. Should I laugh or cry?
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