I go 10k on either Castrol Syntec or Valvoline Synpower. Never one concern.

 

I don't know about that. It's kind of hard to be in the Normal Schedule.

 

I dont consider stop and go severe unless your a Taxi driver.

My car gets tracked often, and idles all day yes all day. Its easier on the car and me to leave it running. I shut it off for lunch and the occasional bathroom break. Even on conventional Dino oil 8-10k intervals were ok. I had/have the oil tested often and have never had less than a 2.8 TBN or a bad report.

3k is a scam and a waste of resources and money. Especially on modern oils and motors.

 

very hard

but then again you car does not go through many heat cycles either, with very short trips down to say the grocery store, instead it stays warmed up all day long, which is not going to be as hard on oil

 

 

My RCM analysis says that from the consequences of failure, etc., that I should change the oil every 12,684 miles on synthetic.

 

You should bring them donuts or pizza or something every once in a while for that. It can go a long way when you need the service writers or manager for something costly.

 

That's a zddp issue with flat tappet cams. They had to significantly lower zddp levels to meet SM requirements. Supposedly the zddp will hurt catalyst efficiency which is BS. I've had an oil loaded with it since the second oil change and it's getting close to 100,000 miles now. Once again sacrificing wear for emissions/fuel economy. In the GN world, cams started failing before people realized they made this change to the oil. I guess the powers that be decided flat tappet cammed cars were a small enough minority that they just didn't matter so they quietly made the switch. I big f-U in our faces IMO. Another reason I run Redline in everything.
If you read closely, just about everything except for extended freeway driving will qualify as severe duty. They would be better off listing what does not qualify.

Depends on the oil and filter. I use a RP s2000 filter on my TL. It has superior flow, filtration and loading. 15,000 miles is normal on this filter.
Define excessive... There is no one size fits all. You can't say bi-annual for mineral, etc, etc. Mercedes, Porsche, and BMW have a much larger capacity than your average car. This is how they get away with the long intervals. There are so many variables.

The 3,000 mile oil change did have some validity for 2 reasons. The oil of the day and carbureted engines. Oils have improved and closed loop feedback fuel injection has greatly reduced the demands on the oil and engine wear.

A high strung 4 banger is harder on oil than a large V8 at the same power level.

Over time, additives get depleted, oil oxidizes and shears, and then you have the contaminate load. If I didn't have the contaminate load to think about, I would run my Redline to 15,000 miles no problem since it won't shear, oxidize, and it has tons of zddp, moly, and other additives.

 

X@ reason why a say such a huge majority of people should follow the severe schedule


when you dump 9 quarts of oil in a 3.0 liter in an BMW X5, JUST to get it to the full mark (for a fair comparison, the 2JZ in the Supra only takes like 5-6 quarts of oil, and both are inline 6's) (btw it was also Mobile 1, as per the oil cap lol), you wounder why you are able to do longer oil changes on them


yes indeed 4 bangers are harder on oil, especially when they normally take less oil to begin with, let alone revving higher for the same amount of power output (and turbo's are more commonplace on 4's, which skyrocket's the wear and tear on the oil when driven like they should be )

 

Ironically, I just changed the oil in my MDX today after having gone 380 miles beyond 0%.

 

I go about 6-8K Km a year, and I do my oil change once a year, along with the filter. 5w-50 this time. For an H6, I'm doing real well and not consuming any oil.

 

http://www.youtube.com/watch?v=TuEdU_lrtZk