I change every 5k - any less then that and your wasting money. My old car had 160k miles on it and sold it without problems and my RA has 60k and no problems.

 

That would be interesting. Get on that.

 

I have used Blackstone since I bought my Evo used with 18k miles on it.

First oil change ran 3k miles - looked brand new
Second ran 3.5k miles - almost no difference
...
Last oil change - 5k miles - Blackstone suggested that I should try another 1k miles on the next oil change since they were seeing so little difference in the oil samples.

Being able to run an extra 1k miles on the oil _and_ no that it's doing no harm to the engine means that the analysis is paying for itself. I'd recommend them to anyone who cares about their car.

 

Sample kit ordered.

Could be a while before I send it in, though. I don't specifically remember the brand and viscosity of oil I used last time. Might have been RP 5/20 or 5/30, or if I couldn't find RP when I needed to change oil, I might have poured in M1.

I'll write it down at my next oil change, and send in a sample of that oil when it gets drained 5000 miles later. Hopefully some time in early Spring.

 

Just got my analysis back. I usually change around 3500 miles. Looks like I am going to try 5000 miles next time.
They say the filter is doing good. Although it looks like the TBN is a bit lower on the Mobil 1 than the Royal Purple that Otter uses. Also looks like that Royal Purple may have more detergent additives and anti-wear additives.
I have about 47k on the clock. I like that they said it looks like a great engine.....and I have done several autocrosses with it.

 

Got my results, and put them side-by-side with otter's and E2L's. I'm not sure if it was because my sample was run in winter, but after 5000 miles, mine was definitely more used up than otter's.

They still said it looked good, and that I should try again after 6000 miles.

 

Nice....thanks for the side by side. I am coming up on another change.....gonna try 5k miles this time and see what they say.

BTW --- I use PureOne filters...Otter uses OEM.....what does Mys use?

 

I'm going to be doing another one just as soon as my amsoil order shows up. The oil in the car is still 5w30 RP, but it has ~7k on it.

 

eclipse2lancer why does it say mitsubishi 2.3L on your oil report. shouldnt it be 2.4L

 

otter... just wondering why you had to add 4.5qts of make up oil over the course of 5200 miles on this oil change interval?

 

I didn't have to, it was an error on my part, I misunderstood the question on the original form. Between oil changes I usually have to add between .5-1 qt at various intervals.

 

yep...they must have mis-typed it.
Unless I got hosed with -.1 of a Liter.

 

I use Pure-One.

 

does anyone else ever have to add oil inbetween oil changes? cuaes i never have.

 

I don't. I checked it pretty religiously when the car was newer. As I put more miles on it and it still didn't use any oil, I stopped checking it so often. Now I don't even pull the stick until 3000 miles have gone by. Then I'll check it again at 4000, and change it at 5000.