My car has 117K miles and yesterday and changed the oil from Mobil 1 5w30 to Castrol Edge Syntec 5w30 with a KN oil filter. Also I added a bottle of Z-Max to the mix.

Lets see how the car is affected with those changes.

 

What kind of changes are you expecting to see?

 

 

Send your oil to http://www.blackstone-labs.com/ to get an accurate analysis of your oil.

The only real way to see a difference is if you sent your old Mobil 1 and compared it to your new oil.

 

expecting a 1 hp increase? :P as long as its synthetic you are good to go

 

nope..UOAs definately shows that some are better than others.

 

expect less clunking at startup lol

 

True enough, but frankly, beyond a certain point . . . WHAT"S THE POINT?

Since you don't just keep your car in a glass case and never drive it (so that there is no engine wear occurring), you have already implicitly declared acceptance of the fact that you ARE going to have engine wear. Now, once you've accepted that fact, the only real relevant concern should become mitigating that wear to an acceptable level such that the engine will not suffer undue degradation before its time. You can do all the UOA's you want, but the simple reality is that for 99.9% of the cars out there, they will arrive at a junk yard one day for reasons other than those resulting from not using the ultimate oil with the ultimate UOA results. IMHO, people get a little nuts about all this stuff. Chalk it up to fantastic marketing and an apparent increase in OCD on a cultural level I guess.

Regardless of brand, if you use the correct oil spec and you change your oil routinely, with shorter intervals for dino or longer ones for synthetics, the chances of you EVER experiencing an oiling related engine issue are next to nil.

 

In the moornings I have some sputering when cold.
Now is gone after the Castrol Edge 5w30 and the Z-Max, I cant believe it! .

I did tried Mobil 1 0w40 and it was more sputering (after reading in Bobs the oil guide).

Also the engine sound smoother.

Gonna go to the dyno next week to see how much hp a 116K miles G35 can have (new was 245 whp stock at 88 Deg F).

Let you know the results.

Thanks to all

 

Told ya. Lol @ people swearing by Mobil . I experienced the same results

 

Oh *** man that was funny !!

I swapped from mobil 1 syn to Shell Rotella T6 or what ever its called as i had a consumption oil issues , fixed my problem..

 

i wouldn't have put that z-max in there.. probably thickens the oil..

maybe put it in the last 100~500 miles before a change.. if you needed a "cleaning"