Last summer thanks to a lack of time I ran 4 track days (2 weekends) and close to 3000 highway miles on my oil. I felt horrible about that since I was changing after every weekend before that, but I sent a sample to blackstone and they said to run it longer next time. :)

Sig what exact oil were you using?

I just ordered the sample kit. Heck...they send the kit to you for free and it's only $25 to get it tested...you can't go wrong there for peace of mind.

Also ordered 6 quarts of 5W30 Redline today! :)

Please post your results! You are using the Nissan Ester currently and will change that out and have it tested? Def want to hear about this! Thanks in advance.

Also if you notice anything about your switch to RedLine, feel of the car, more importantly engine sound and temps.

Red Line 5w30. Just an anecdote, ymmv. :)

I have Redline currently in there now, so that's what will be tested. I am very curious to see what the results are. I have a feeling that even after 6k miles, I'm still going to have some life left; but we'll see. :)

The first 30k miles, I used the Nissan oil and then switched to Redline in January and the car runs much smoother and even a few degrees cooler (as far as oil temps go).

I'm glad you are doing the oil analysis. Thats the best way to determine if you interval was too short, too long, just right. That fuzzywuzzy guy doesn't know what he is talking about. It depends how you drive the car and the synthetic oils today can go over 10k miles. The filter is what needs to be changed and is usually the limiting factor.

My dad goes 15k miles using Amsoil in his Sienna and changes the filter only at 7500. His car has over 100k on it and runs perfect. Not saying thats the right thing to do but the only way is to get an analysis of the actual oil, not basing it on what a book says.

Also I feel that the 3750 in the owners manual is very conservative because Nissan would rather change the oil a couple more times in the warranty period than possibly replace engines if people drive their cars hard and don't change the oil often enough (especially if not using synthetic).

I agree with you 100%. I have the Purolator PureOne filter in there now. Supposedly they are pretty good...we'll find out when I get the analysis back. :)

I change the oil in all my vehicles (2012 370Z, 2001 Porsche Turbo, and 2002 Silverado) at 5K miles. Makes it easy to remember on the odometer. The Z and Turbo get Redline and Mobil1 Synthetic respectively and the Silverado gets plain old dino oil. The Silverado is currently at 150K miles, runs like a top, and the only repair I have ever done is a fuel pump at 100K miles. Doesn't burn a lick of oil.

Changing your oil at 3750 is silly IMHO, but if it makes you feel better, it certainly won't hurt...hell, changing at 5K is probably silly for that matter, but its an easy to remember system for me. Modern EFI engines put MUCH less contamination into the oil due to better fuel metering/combustion, and tighter manufacturing tolerances. As long as you are regularly getting the oil hot enough to burn off moisture (hardly an issue with our 370's HA!) modern synthetic oil is probably good to 15K intervals. If I was going that long though, I'd be checking regularly with oil analysis, but at 5K intervals, its a waste of money unless you are looking for something specific.

It is as simple as checking your dipstick.
I thought I could just stick to a 7500 mile interval with Redline like in the DIY that AK370 made but I realized at the next oil change how black it was. Since then, I've adjusted it to about 5000 miles. It really just depends on how hard you drive it. I drift mine and frequently hit redline

you never have to change your oil. in grand trismo my z has like 20 k miles and i havent changed the oil and it runs amazing =p

Thing makes me laugh often is people will spend tons of money on synthetic oil and then use a cheap crappy oil filter. Oil filter in my opinion is more critical than brand of synthetic oil that is approved for our cars.

If you have a good filter and your putting mostly highway miles on your car there is no reason you can't go for 5000 miles safely.

I'm not a fan of keeping contaminants in motor much longer than that.

déjà-vu all over again...:facepalm:

U got jokes

You can't base it off color, why not do an oil analysis to see the real condition of the oil?