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Sedans Infiniti G35 Infiniti G35 Engine Break In
68 messages, Last post on Dec 05, 2008 at 9:36 PM
You are in the Infiniti G35 Forum. Your Hosts are pat & karens
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It never ceases to amaze me how folks follow their owner's manual but when it comes to fuel recommendations, if it says 'premium' they think it's a con. Of course it will not ping. The timing is retarded thanks to knock sensors and a smart ECU. And mileage will only be slightly affected. But wheel HP can be reduced as much as 10%.
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Replying to: dboe (Nov 26, 2006 11:31 am) Here are some quotes from the Infiniti Operating Manual that came with my car: "Use unleaded regular gasoline with an octane rating of at least 87 AKI." , "You may use unleaded gasoline with an octane rating as low as 85 AKI in high altitude areas", and most interesting"You get the greatest fuel benefit when there is light spark knock for a short time under heavy engine load". The funny thing about octane requirements, is that once you have satisfied the basic need, that additional octane rating is of no use at all. The octane requirement may well be different on later G35s with their higher engine rated power, as Infiniti may have squeezed the tuning differently in order to advertise more HP . Funny thing is, the newer ones don't seem to be any faster than the 260 hp G35s. Go figure.
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Replying to: 01redz06 (Nov 26, 2006 6:01 pm) Didn't they increase the curb weight along with the horsepower? Roll |
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Replying to: 01redz06 (Nov 26, 2006 6:01 pm) I should have made that distinction earlier. The models are tuned for different fuel recommendations. |
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Our G35x is a late 2005. Took a long trip -- Yellowstone -- when it was nearly brand new. We DID vary speeds, stay off the Interstates some, and pull it down into a lower gear at times. In Montana, we stopped at a Nissan dealer (the V6 is plenty familiar to them) when we were near 2000 miles. The Service Mgr. was really convincing that it could go to 3 or 4000. "We NEVER see any "metal flake" in the oil on the first drain". Now the point. I had thought but he said it before I asked -- "DO NOT use synthetic till you have at least 10 - 12,000 miles on it!" he said. "It won't "Break in" properly if you use synthetic". And as to break in ... if anybody reads Car&Driver, pay attention to the "long term tests" that C&D does every few months!! Lots of times a car with 40 to 50,000 miles has BETTER performance and even braking than it did when new. "Back in the day" when I rebuilt a 283 Chevy, I checked the compression before starting it up. Something like 40 psi. Start it, run it a few times, check again -- then like 65 psi. The rings seat, of course. Drove it 2 - 3 weeks and check (a couple cylinders) ... its nearly 95 psi. A year later (putting headers on) I checked again, and it was like 105 to 115 on all!! Break in!
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The Synthetics question is frustrating.. I have my 07 G35S coming on 2/7 which I ordered in October and I've had a lot of time to google all about this subject and what I find is two things. The main point, is no one knows if Synthetics are good or bad, no one has done any testing of any sorts. There is considerable talk that conventional oil is better for the car for the first 10-20K miles, that it helps the car break in better then Synthetic. That Syntetic is TOO slick and actually can get past gaskets and such and leak on a new car. This camp has no evidence to support their statements. Then there's a smaller crowd which is made up of those that have/follow European Luxury/Performance vehicles and most racing teams. Why is it that ALL European auto makers start off from mile 1 with Synthetics and don't do first oil change until 15,000 miles? They must know something right? but again, they don't have any testing evidence to support their action. However they do have very detailed tests specifically on Synthetic oils vs Conventional Oil, where Synthetic outperforms conventional in every possible way when it comes to heat, viscosity, purity, breakdown, smoke point etc... any test you run, Synthetic is the Energizer so to say. So what's to believe? My theory is this, and it's a little bit conspiracy, but makes sense and has evidence to support. Synthetic is better. hands down. Conventional oil in North America has a recommended oil change cycle of 3000 miles. Anywhere else in the world, that exact same quart of oil has a 7500-10000 mile change cycle. Synthetic in North America carries a recommended 5000-7500 mile change cycle, anywhere else in the world it's 15000-25000 miles. Why is this? Well I think it has to do with the service industry greed, 80 years ago we all started out with the same service intervals, but over time, the world has realized it's unnecessary, however in North America we stuck with the lower cycle for little to no reason, other then we were building cars of lower quality and lower tolerance. The dealers and auto mfg's are pushing the consumer to get unnecessary service, just like most of the bundled services they offer at your dealer, to drive up profits. at 30K you don't need a tranny flush! So I feel that Synthetic from the start is the BEST you can do for your car. and the service interval is around 15K miles or 12 months, which ever comes first. Now I still struggle with not making the first oil change a litle sooner, so I'll pay for a 3000mi change, then the next one is 15K miles. and go from there.
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Replying to: kring5 (Feb 02, 2007 4:49 am) In fact, Mobil 1, 20 years ago, offered 80,000 between changes. (It was doc'd on the bottle) It is still recommended to change the oil filter and then top off the oil to replace that which was lost in the filter change. This should be done at a much more frequent interval, like 3,000 - 3,5000 miles. |
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Replying to: scottm123 (Feb 02, 2007 5:53 am) I change at 1000 miles and always find metal in the filter. I change then every 3 to 4K as long as I have the car. I agree synthetic does not break down like petroleum based oil but I believe the problem is contamination and whether you use synthetic or petroleum, they are both subject to contamination. Am I wrong? Roll
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Replying to: rollbar (Feb 06, 2007 6:01 am) When I had 2,500 miles on it, I went to the dealer and asked for an oil change. This was early, as they suggest the first change at 7,500. The service manager sent me home, without my oil change. It was explained to me that the oil comes from the factory containing special additives to assist with correct engine break-in and should not be changed out early. Dunno... 
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Replying to: rollbar (Feb 06, 2007 6:01 am)
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