Last post on Dec 05, 2008 at 10:36 PM
You are in the Infiniti G35
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Infiniti G35, Sedan
#1 of 68 G35 Engine Break In
Nov 19, 2006 (9:47 pm)
I just purchased an 07 G35 Sedan. After I did, I asked my salesperson if there was any recommended engine break-in tips (not revving over X RPM, not driving for long periods of time at the same speed, etc.). I was told there was no break-in period, and drove it hard a couple of times (as well as on a relatively long trip).
Does anyone know if this will adversely affect my car's engine? I've heard conflicting things regarding the issue.
I appreciate any input you may have in advance.
#2 of 68 Re: G35 Engine Break In [dargib01]
Nov 20, 2006 (6:47 am)
Best would be to read the Owner's Manual. My 05 required 1000 miles at no more than 4K RPM but to vary the engine speed as much as possible.
#3 of 68 Re: G35 Engine Break In [esfoad]
Nov 20, 2006 (8:52 am)
Same on the 2006. I thought it was 1200 miles but I could be wrong.
I have found the story is the same regardless of where you go: Dealer says no break-in required; book says take it easy for a 1000 miles or so. Porsche was the same.
That said, I don't think you did any damage, and wouldn't worry about it.
I do like to drop the oil out at 1000 miles, (and change the filter); have done so for all my cars for several years now. If you examine the filter after 1000 miles I would bet you'll see some metal shavings. I always do. Then I go into a regular schedule of oil changes every 4000 to 6000 miles.
On break-in..... I was a little disappointed with the performance on the 06 Coupe at first, (after the break-in period). Seemed a bit sluggish compared to the 05 Coupe I had. After 5000 to 6000 miles I started to notice a bit more oomph and now, at 8800 it is everything the 05 was and more. I am satisfied with the pull under acceleration (for a stock set up anyway; wonder what a supercharger would add to seat of the pants reckoning?)
So a question to those who know or might have an opinion or idea, do cars in this day and age, need to wear in before you get close to performance potential?
#4 of 68 Break it in without breaking it...
Nov 20, 2006 (2:37 pm)
Not my first experience with a late model car that seems to get better after the first 10,000 miles or so.
I don't believe they have to be babied. If you have an MT I would certainly avoid lugging the engine. Not easy to do with so much torque BTW.
But I think warming up the entire drive-train while driving is essential new or old, before romping on it.
I can understand long garage warm ups of a minute or two in the coldest climates, but normally, we should be on our way in 30 seconds.
As far as break-in, build up rpms slowly over the first few
Brakes should be bedded in too, but that's another subject.
Tires should not be stressed for a couple of hundred miles either. Maybe I am just obsessive, but if you do some research there is a lot to support this.
Avoid the cruise control, vary speeds at cruise. With the 5AT you can shift periodically between 4 and 5 while on a long trip.
In summary, enjoy it, drive it 'normally' not like it's race day, except for occasional sprints (like 25 to 70) followed by engine braking/coasting and repeat several times, for helping the rings seat.
#5 of 68 Re: G35 Engine Break In [dargib01]
Nov 21, 2006 (10:16 am)
Most of these sale people are dumb as a box of rocks. Advice: Just break it in. It's logical to do so.
#6 of 68 Re: G35 Engine Break In [factfinder]
Nov 21, 2006 (5:16 pm)
The most basic thing is varying speeds, not holding it a constant RPM. The fact the sales person did not at least know that much says a lot about how little he does know.
While I agree a good salesperson could sell anything, a smart one will get you the right answer if he does not have them.
#7 of 68 Re: G35 Engine Break In [dboe]
Nov 22, 2006 (1:49 pm)
When I took auto shop at a community college quite a few years back, that's what the shop teacher recommended more than anything. He said he took every new vehicle he bought to an isolated stretch of road and repeated taking it from a stop to about 50 or 60 miles (in a gradual manner) and back down to a stop around 15-20 times to break it in properly.
That's why, if and when I order the G35, I want one that hasn't even been test driven. At least in my neck of the woods, the Infiniti dealer isn't soft on the test drives whatsoever and tells us to let it show us what it can do during our test drives.
I am obsessive about car care and maintenance and I want to baby my car through the break in, although the temptation to unbridle the thing will be extremely frustrating.
#8 of 68 G35s break in
Nov 22, 2006 (7:22 pm)
I broke mine in easy for the first 500 miles, varying speed, no full throttle, etc. Mine has over 42000 miles on it now and runs great, no oil consumption, etc. Mine has been run for 42K, almost exclusively on 87 octane. and does not ping, runs great, etc.
I changed it over to Mobil 1 at approx 7000 miles Based on gasoline mileage, I would say the engine broke in at 10000 miles, where the gasoline mileage took a significant increase. Urban mileage is approx 19 - 20 now and normal highway mileage at 80 to 85 is 25.
I think it could get better at slower speeds, but sorry I cannot accumulate this data.
#9 of 68 What does the manual say?
Nov 26, 2006 (12:31 pm)
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%.
#10 of 68 Re: What does the manual say? [dboe]
Nov 26, 2006 (7:01 pm)
I agree with you that the engine will not ping. The ECU will pull back the timing if it detects preignition. What I am telling you is that if this is occurring on my 2003 G35s, the effect is much, much smaller than a 10% loss in power, because 10% would be very noticeable to me. Is any loss occurring?? I am not sure. If it is, it is hard to find in a back-to-back run of 87 vs 93 octane fuel, at least up to 90 mph.
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.