So which Oil Is Best??
 

'06 G35Cp MT - right at 100k miles: Doing my first oil change: What's the absolute best regardless of price? Thank!:JAMIN:

Mobile 1 end of story or kindle if u can find it

If I bought a car with 100K miles on the clock I'd want to know how it's been serviced in the past and with what. If they were using Dino oil and not changing it frequently I'd be afraid to use a high quality synthetic oil in fear of destroying the engine. If you can find out what they used for the past 100K miles....stick with that and use WIX filters.
Gary

For the VQ, German Castrol. And, you can find UOA's to prove it.. It's about $8.50/qt. I have previously purchased at Oreillys and AutoZone (but call around first, not every store carries it).

Thanks for the help! Got ahold of the previous owner who's had it since day one:JAMIN:

what wieght? 5-30?

Mobil 1 Synthetic since day 1

Wrong.... based on numerous used oil analysis results, that oil is actually one of the lower-rated oils for our specific motors.

German Castrol and Amsoil are generally acknowledged to be the best for our motors. There are at least 500 threads on this topic already.. do a search.

Question: the previous owner used mobile 1 5w30 for its whole life - safe to change at 100k miles?? Thanks

Yes... it's safe to change.

Don't get me wrong... I'm not saying that Mobil 1 is a bad oil... it's just that it fared worse than some of the other "synthetic" oils out there based on Used Oil Analysis results of a bunch of people specifically on VQ engines.

You said you wanted the absolute best, and Mobil 1 is not the best for this application..... it's more than sufficient, just not even close to the best.

The Amsoil fully synthetic and the German Castrol are actually real full synthetic oils and got great results on UOA lab tests for our motors. You can only buy the German Castrol at Auto Zone, but it's not always in stock. Amsoil, you either have to order online or buy from a vendor who stocks it. I personally think it's worth it to just pay the $20 a year to get an Amsoil preferred customer membership, since everything is about 10-15% cheaper than list price if you have that membership and buy a lot of their lubricants. It pays for itself easily over the course of the year if you fall into that category. I use Amsoil in the tranny, both differentials, power steering, clutch and brake fluid of my truck, and the differential, brake and power steering and clutch fluid in my G35, as well as the motor/tranny/clutch, brake-fluid and clutch master cylinders in both my dirtbike and motorcycle (as well as their intake air filters for my car and truck and their oil filters on my motorcycle)... so the Amsoil membership easily pays for itself for me over the course of the year. The only places I don't use Amsoil are in my G35 and Tacoma motors and my G35 transmission. I use OEM Nissan manual transmission fluid in the G35 tranny, German Castrol 0W30 in the G35 motor, and either Mobil-1 or regular Castrol Syntec (not-german Castrol) in my Tacoma motor.

yea im surprised at how many love mobi especially with that oil analysis of it floating around. for me its castrol all the way

people love drinking cool-aid lol

In the long run (>10k miles), some oils might turn out to be better than others. If you change your oil frequently, I doubt M1 is inferior to anything else.

^ I don't think that's true considering the UOAs were performed well below 10k miles.

Amsoil for the win.