SHELL Helix Ultra 5w40.

Runs Smooth/better more than others 5w40 tried (such as Castrol, Royal P., Agip)

 

i use Mobil 1 syntenic 5w-30 year round...with Marvel Mystery oil as well...

before oil change i run some Sea Foam in crankcase to also help with carbon deposits

edit

matter of fact...i gots to due my oil change on Nov 19...even though it has not been 3k yet

if i had a turbo on it...would be 2500 every change

 

http://www.bobistheoilguy.com

Join their forums and learn from them.

 

second ^^^ that

Mobil 1 isnt even a true full syn, its a class3(?I think it was) petrol synthetic. Same with RP.

I use Rotella T 10w30?(I think maybe 10w40) in my VR4 and from what I've read, seems to have best additives.

 

I've used just about every brand out there, but never synthetic or blends. I've been religious about oil changes. I'm approaching 3K since my last oil change (done at 147K) and there hasn't been a change in my oil level, and the color checks good. My motor doesn't smoke, so I'm likely good on my compression/valve leak downs.

I am probably loosing performance gains in not switching to syns or blends, but how much HP or torque can I really gain by making the switch? With a stock motor such as mine, natural oils has worked for me.

If I was stressing my motor w/ many mods, I would probably switch to AMSOIL. I've read their comprehensive report on oil tests against synthetics from Shell, Mobil, Castrol, etc, and it's impressive. I'd look at their website and give it a shot.

 

^^ You shouldn't judge an oil by its color. Instead, you should do an oil analysis to see how many metals you have in your oil. I recommend blackstone oil analysis. I posted a couple on here but they disappeared.

Amsoils have always been good on oil analysis . I recommend them. Seriously, use synthetics; you'll never go back.

 

for years i'have been using castrol syntec blend on various cars and have no complaints. its cheaper than full synthetic and at around 3k miles on it still comes out pretty clean.

 

Wow, I was just reading on amsoil's site and with their oil they recommend changing only once every 25k??

I'll have to read up on that more later.

 

I'll never use Amsoil for the simple reason that the oil is secondary in their business model. A large part of their business is MLM or recruiting dealers. I'm going to start using Nippon Oil's Eneos oil.

 

<div class='quotetop'>QUOTE (Supercow @ Nov 6 2009, 07:09 PM) <{POST_SNAPBACK}></div><div class='quotemain'>Wow, I was just reading on amsoil's site and with their oil they recommend changing only once every 25k??

I'll have to read up on that more later.</div>

Well, that's for non severe use. For Severe use, it's 15,000 miles. You have to flush your engine and then use their Oil filter as well. Since part of the reason is to save money on oil changes, it's not good for engines that burn a quart every 3,000 miles like my Tiburon. I currently use their cheaper XL range. It promises 7,500 miles of protection and it according to my oil analysis, it still had a lot of life left even after 7,500 miles.

<div class='quotetop'>QUOTE (i8acobra @ Nov 6 2009, 07:32 PM) <{POST_SNAPBACK}></div><div class='quotemain'>I'll never use Amsoil for the simple reason that the oil is secondary in their business model. A large part of their business is MLM or recruiting dealers. I'm going to start using Nippon Oil's Eneos oil.</div>


.. that's how they sell their oil. It's just normal business. I"m sure Nippon and Eneos oils has their own way of marketing/advertising/selling.