View Poll Results: What will the blackstone oil analysis say about 15,000 mile old oil?

The oil will be terrible, totally degraded, you've ruined your engine

24.07%

The oil will be just before/past its useful life, you've found the perfect change interval

51.85%

The oil will be fine, you could have gone longer

24.07%

Voters: 54. You may not vote on this poll

15,000 miles between oil changes - Results?

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09-05-08 | 08:30 AM

#16

Technique

Thread Starter

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Joined: Aug 2006

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From: DC

Changed the oil and sent it out via priority mail to Blackstone...

My mechanic was like "This oil is pretty dirty, how many miles has it been?"

And he also said "Maybe 5 or so quarts came out, maybe you were running a little low"

Last oil change I only put in 6 quarts... This time he put in the required 6.6 quarts...

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09-05-08 | 08:42 AM

#17

Kurtz

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From: NC

Why did you underfill it last time?

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09-07-08 | 10:27 AM

#18

Koz

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Joined: Jun 2006

Posts: 2,752

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From: Utah

Looks like after one year everything is OK and normal. I will update next year.

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15,000 miles between oil changes - Results?-uoa-is350a.jpg

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09-07-08 | 05:30 PM

#19

spwolf

Lexus Champion

Joined: Jan 2005

Posts: 19,955

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Quote:

Originally Posted by aids

itll be fine. oil lasts a long time...people are just paranoid and ocd, and shops and dealers like to tell you to change more often so they get more money. numerous manufacturers as well recommend oil changes at 10k+ intervals in their manuals

10k is ok, but when manufacturers reccomend more than that (20k and 35k) it is usually paired with both long life oils, and oil check which warns you if oil needs to be changed sooner than that.

saving few bucks on oil, on $40k car is crazy.

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09-07-08 | 05:44 PM

#20

huddleston

Racer

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From: AR

interesting topic, never thought of having this done.

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09-08-08 | 02:16 PM

#21

Technique

Thread Starter

Lexus Champion

Joined: Aug 2006

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From: DC

Quote:

Originally Posted by Kurtz

Why did you underfill it last time?

No reason, just lazy... Only had 6 quarts, didn't realize it needed 6.6...

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09-08-08 | 02:18 PM

#22

Technique

Thread Starter

Lexus Champion

Joined: Aug 2006

Posts: 1,883

Likes: 5

From: DC

Results are in...

It was only 14,000 miles, not 15,000, but close enough... Anyway, the results are back and all is well... TBN was 0.8 (I'm surprised it was that high) and everything else looks good... Interesting comment they made about wanting to get the metals out of there... But this shows that regular, cheap oil can go to 14,000 miles in our cars with extreme conditions just fine IMHO... Thoughts?

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09-08-08 | 03:01 PM

#23

isdreamz

Driver School Candidate

Joined: Mar 2008

Posts: 28

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From: TX

Quote:

Originally Posted by Gaugster

What were the oil filter change intervals???? 5k????

I'd like to know this too !

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09-09-08 | 05:13 AM

#24

Koz

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Joined: Jun 2006

Posts: 2,752

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From: Utah

Technique - 14,000 miles on that oil is too much. It looks like 12,000 is the safe number regardless of brand. I will run one more change with the 0w-20 then I will use the 0w-30 and see the results.

Koz

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09-09-08 | 05:20 AM

#25

Koz

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Joined: Jun 2006

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From: Utah

Technique- What air filter are you using and are you in a high dust area? I'm using the K&N.

Koz

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09-09-08 | 06:39 AM

#26

4TehNguyen

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From: Houston, Texas

Quote:

Originally Posted by aids

and these manafacturers mainly use synthetic

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09-09-08 | 01:12 PM

#27

Technique

Thread Starter

Lexus Champion

Joined: Aug 2006

Posts: 1,883

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From: DC

Quote:

Originally Posted by Koz

Technique- What air filter are you using and are you in a high dust area? I'm using the K&N.

Koz

Stock air filter... I changed it out for the first time like a month ago, around 22k miles and 1.5 years after getting the car...

Other than the A/C filter (which I change every 4-6 months), I have done no other maintenance to the car besides put air in the tires.

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09-09-08 | 02:03 PM

#28

insider

Pole Position

Joined: Mar 2006

Posts: 201

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From: NV

3,000 mile oil changes are the biggest scam ever.

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09-09-08 | 03:47 PM

#29

timmy0tool

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From: 714/949, SoCal

the oil change interval is one of the most talked about topics in all automotive message boards, and i still don't have a clear answer. same issue with synthetic vs. conventional.

let us know what you find, in a year.

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