You're not going to "feel" any difference. What you will get is tremendously longer oil life. I run mobil 1 for 12k to 13kmi.

Check this out: http://neptune.spacebears.com/cars/stories/oil-life.html

 

Interesting study.
Something of note: even if fully synthetic oil is less prone to breaking down into sludge (it is), your oil filter loses won't last "forever."

Most of these experts (including "Bob the oil guy" -- google him) recommend that the oil FILTER be replaced every 5K miles.

If you are replacing the oil filter ever 5K, it's easier for most people to replace the oil at the same time.

-g

 

I am on my third oil change with Royal Purple. I run it 4,000 miles between changes. I noticed the car idling a little smoother and quieter on start up. I have decided that I will return to regular oil once I use up the case I bought as I don't think its worth the extra cost.

Even though the oil flows better at low temperatures is proven to last longer than regular oil, I would rather change my oil more frequently and would not be comfortable leaving oil in my long enough to take advantage of the longer life.

If you are racing/reving the car at very high rpm, I think synthetic oil is the only oil to use.

 

Many, many threads on this. Myself? I run AMSOIL 5W-30 pure synthetic with an NSX filter.

 

Mobil 1 5W-30 is my oil of choice in my three cars; 93 Legend, 05 Lexus RX330; 95 Integra.

I also use Mobil synthetic gear lube.

Gary

 

I went to a shop that only works on acuras and hondas to get service done on my car. An old japanese guy who had worked for honda and spoke broken english is the owner. He recomended me to use 10w-40 and not synthetic on my legend due to its age. Has anyone else heard of this?

 

Yes, the reason he said this is old motors sometimes need thicker oils so they wont leak. Synthetic oils are quite thin and will leak out of old seals and slip past worn rings causing smoke.

 

I run regular, but if you need cheap M1 Syn, the walmart has the best price. 5 qt for $23.

 

I've been running amsoil for my camry starting at 57K. Now it's been over a year at 68K. Just changed filters 3 times. I'd recommend it. But hesitant to run it on my legend with 184K since it's got high miles. My camry seems to run smoother but who knows. I like it because I don't have to change engine oil every other month between two cars.

 

I used to run Valvoline Full Synthetic, but switched over to Royal Purple. Not too much of a difference. But i do think Royal Purple is better.

 

I've been using mobile 1 10w30 regular and 5w30 regular in the winter. I have no desire to put full synthetic because I enjoy getting my oil changed every 5k miles. (I also think that a car with 121k miles doesn't need syn oil) Regular oil works for me

 

Castrol 10W-40

 

mobil 5w30 from 140k to present 213k.

 

I am runing on Mobil 1 extrend performace. It just nothing but facy oil. just like you drink expensive liquor and cheap liquor. the the chemical compose are alittle difference.

 

I like it cause it's purple, and tastes like grape!:yumyum: :yumyum: :yumyum:

 

Castrol Syntec, 10w-30 or 10w-40 for the summer, 5w-30 for winter. I used to use 5w-50 until I found out that the narrower the viscosity spread the better.

 

Having worked in a petroleum chemical lab where we did engine oil testing (Lubrizol Corp), I can say that the synthetic oils are superior to dino oils. They are much more resistant to sludging, they are nearly impossible to oxidize under high temperatures, and the lubricity is measurably better.

Now, with that whole urban legend thing about burning/leaking due to synthetics? It's just that: urban legend. It's coincidental that people start losing oil after a while when they switch to synthetics (or they are simply just paying more attention to it due to the switch). My 88 Prelude got nothing but Mobil 1 5w30 from 140,000 until I pulled it at 280,000, and I kept the engine from the rust bucket when I junked it because it still wasn't burning or leaking oil at 280,000 miles.

Likewise, I switched my Legend to Mobil 1 5w30 at 130,000, and it went from burning 3 quarts in 1500 miles to burning less than 1 quart in 3000 miles.

Further: running thicker oil in your older engine is NOT recommended. If you have larger clearances due to wear, things will be making noises! The clearances as well as the oil passages (especially in the pistons) are not designed to pass more viscous oils and you can wind up starving parts of your engine for oil or not allowing all the oil to be wiped from the cylinder walls by the rings because it can't pass fast enough through the oil return holes in the pistons and then you WILL burn oil. Likewise, oil acts not only as a lubricant but also as a coolant. Reducing the oil flow with thicker oils will reduce the cooling effects of the oil and put more of a strain on the cooling system as well as subject the internals of the engine to higher temperatures. Yes, thicker oil will not leak out as fast... but it's NOT the right way to fix the problem, either.

Take it to heart folks. I wouldn't BS ya.

 

I switched to Valvoline MaxLife Convention 5W30 at 150K. Eh, so so, didn't notice much of a difference, engine was buttery smooth for the first 500-750 miles and then was the same as whatever crap the dealer was putting in.

Switched to Valvoline MaxLife Full Synthetic at 170K. Amazing difference on cold starts. Before, with conventional, starting the car in the cold, the first ten minutes were rough. With the synthetic, small difference between how the car drove warm and cold. Very impressive.

Switched to Mobil One at 176K. Car does not smoke at all anymore, as it did with the Valvoline. Very smooth, very nice. Also just $19.99 for 5 quarts here at WalMart, so why not...

Burning about 1 qt. every 3K, whether conventional or synthetic.

Summary: Noticed no difference other than a very significant difference in cold starting which made it very much worth it for me. Recommend Mobil One from Walmart, 5 qt. value package. You save $10+. Costs me $5 more every 3-4k than conventional.

 

Running Moble 5-30 at 12k intervals. Filter replaced at 3k. I could not detect any change from using regular oil. Just the peace of mind that the synthetic oil is not breaking down as fast.

 

Whats the advantage of an NSX filter??

 

Its bigger

 

I've been a member of bobistheoilguy.com for three or four years. There's a lot of arguments on there about oil life and filter life. I will say this, my grandmother's new Porsche Cayenne (pretty sweet for an 81 year old lady) has 20k mi service intervals.

 

my engine has 200k+ is it safe to switch to mobile 1? I beat the hell out of my car foot to the floor revving to the limit all the time I'd like some protection against that.

Got a FRAM part number for the NSX filter?

 

I doubt you'll have any problems. I switched my legend over at 100k, and it's not having any problems at 140k now. I also run my '92 Saab with over 150k on mobil 1. 0W-40 in both cars in the winter 15W-50 in the Saab in the summer. The legend burns some oil, the Saab burns none, not a drop. I would look into auto-rx. It cleaned a ton of stuff out of the Legend before I switched to syn, and it really helped out the PS in my Saab. www.auto-rx.com

 

I switched to M1 at about 180K in my pickup...no change or oil leakage. I'll be switching to synth at my next change in the Legend (171K) and I won't even worry a little bit about it...

 

Once you start using synthetic oil in any motor you cannot go back. If you go back to regular it will f*** the whole engine up. So make sure going to synthetic is really what you want to do and if you do do you really want to spend the extra money.

 

REALLY ?

I have never heard that before ! And I cant imagine why this could possibly be true. Could you explain this please before I call BS, lol

 

Stu: Are you being serious? I'd heard that the switch to synthetic is one way also...

Haven't bothered to read up and verify though...

 

Stu: Are you being serious? I'd heard that the switch to synthetic is one way also... Haven't bothered to read up and verify though...

Yes I am serious ! I am running on synthetic now (Royal Purple) and am planning to go back to regular oil AND I never even thought that it would cause any problems. I did quite a bit of reading BEFORE I switched to synthetic and I never read anything about this being a one way switch.

 

Big Flick, You've been here for a whole 3 days, but please don't post any absurd mis-information here ... there are too many guys here that know better, so perhaps you might want to do a bit more reading here before you post any more.

When you do post, think quality, not quantity !