Been reading a ton on oil, here is my thoughts.

I did not know the 1NZ to have these issues . I've generally run the five weight 30 has called for on the oil cap of this engine mine are 05 and 09 oil caps state 5 30. I've used 0 30 and 0 40 import car oil plenty. I've never noticed any sludge or any buildup actually at all when I look down in my oil fill hole and it's all nice and silvery and a little bit oily vapor colored a very light brown if you will and I'm doing and have been doing on both of these engines 10,000 mi oil changes their whole lives My 09 is it 350,000 plus and uses I don't know about a quart maybe two in an oil change cycle now and that's running the engine pretty mildly to heavy situations. I don't feel that is bad or anything at this mileage and will continue on heading towards 666 The oil consumption I can do nothing about it was doing this when I got the car My '05 was a little better but then electrically that went to hell and I just left it I didn't even try to fix it It was too far gone had some other damage to the body etc. Oil wise everything seems good wesr wise is similar. I want to try a C I would imagine new spins on the one NZ should be good.

 

In i guess the newer 1NZ in the C?

 

I would agree that changing at 5k is a great idea. Mine has always been changed at 5k intervals and burns very little oil at 271,000 miles. I notice that for the first 3000-3500 miles after an oil change, it burns almost nothing. After 3500, I add maybe 1/4-1/2 a quart- and this mainly if I take it on a long road trip. I could just be lucky on this, or it’s the full synthetic 5k oil changes.

 

Add MARVEL MISTERY OIL to engine oil and the fuel tank once in a while.

 

I have heard good things about Marvel Mystery Oil, is it a cleaner additive? What exactly does it help in doing? On a chemistry level? Assist in breaking down carbon buildup on rings and/or pistons/cylinder walls?

 

5K oil changes with Synthetic oil=Is a waste of $$$

 

Or penny wise, pound foolish?

I did have to give myself a talk this spring. For Canadian 3rd gen, the maintenance interval for oil/filter change is 8000 kms (5000 miles) or 6 months, whichever comes first. I've been dutifully changing the oil on our '10 every mid-April and mid-October, since we never reach 8k kms first any more. Anyway, after this spring's oil change I entered the date/kms in the log, and saw it'd been something like 1500 kms since the previous fall oil change. Think I'm going to stick to yearly from now on.

 

True, but at $23 for 5 quarts I can live with that. I typically go 5k/1 year oci…..since I own 7 cars there’s always 1 or 2 that I put 5,000 miles or less in that time period. 5 of my cars all use 5w-30 so I just buy several jugs at a time and use it among those 5.

That’s where having synthetic is worth it to me, once a year intervals on the lesser driven cars. I’m also aware that owning 7 cars isn’t too smart either lol, but after having paid off the house several years ago, I felt it was that time in my life to start enjoying things a bit (after living tight fisted for many years) so I’ve bought more (paid for) cars.

 

If you really want to evaluate oil change frequency get some lab info on oil at 5k, 7.5k and 10k miles. I did on our pickup, an 04 silverado with 170K miles and towing at 80% of max. Turned out at 6K the oil was still good and the motor is in great shape. Still doing changes at 5K, this puppy works hard and when it is spinning close to 5000 on hills I worry less. But by all means get a lab analysis on your car.